simultaneous equations | Revision Server | Page 1

tulip roost Dec 11, 2022, 1:19 PM

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I'm stuck on this question
can someone help me please

neon crystal Dec 11, 2022, 1:38 PM

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child is x

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Robyn is x+28

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x+28+1=3(x+1)

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x+29=3x+3

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29-3=3x-x

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26=2x

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x=13

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Do you understand @tulip roost?

past pendant Dec 11, 2022, 1:45 PM

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@neon crystal so whats the age of robyn

neon crystal Dec 11, 2022, 1:45 PM

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so the age of Robyn is 42 now

neon crystal Dec 11, 2022, 1:46 PM

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neon crystal so the age of Robyn is 42 now

Sorry I missed this part out

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Thanks for reminding me @past pendant

past pendant Dec 11, 2022, 1:46 PM

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np

past pendant Dec 11, 2022, 1:47 PM

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neon crystal so the age of Robyn is 42 now

how

neon crystal Dec 11, 2022, 1:48 PM

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past pendant how

because in one year time the child will be 14

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so 14+28=42

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42 years old

past pendant Dec 11, 2022, 1:48 PM

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ohhhh

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i forgot

neon crystal Dec 11, 2022, 1:48 PM

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It's fine everyone makes mistakes

past pendant Dec 11, 2022, 1:52 PM

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neon crystal because in one year time the child will be 14

and we assume that robyn doesnt age

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?

past pendant Dec 11, 2022, 1:52 PM

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neon crystal so the age of Robyn is 42 now

Oh yea

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Nvm

neon crystal Dec 11, 2022, 1:52 PM

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past pendant and we assume that robyn doesnt age

he does

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from 13 to 14

past pendant Dec 11, 2022, 1:54 PM

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neon crystal he does

Robyn is the mum

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i mean from 41 to 42 innit

neon crystal Dec 11, 2022, 1:54 PM

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yh sorry my bad

past pendant Dec 11, 2022, 1:54 PM

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and the jerry goes from 13 to 14

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yh

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Are u actually in yr 9 bro

neon crystal Dec 11, 2022, 1:54 PM

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yh

past pendant Dec 11, 2022, 1:54 PM

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ur smarter than some of the ppl in my class lol

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i just asked my friend to do it and he couldnt 😭

neon crystal Dec 11, 2022, 1:54 PM

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oh ok

past pendant Dec 11, 2022, 1:54 PM

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lmao

neon crystal Dec 11, 2022, 1:54 PM

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ok

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I guess maths is just practice tbh

tulip roost Dec 11, 2022, 2:01 PM

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neon crystal Do you understand <@782354813928341564>?

yes thank you

celest urchin Dec 11, 2022, 2:01 PM

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past pendant i just asked my friend to do it and he couldnt 😭

lol i totally wasn't sat working out thsi question by trial and error insteas of using algebra

tulip roost Dec 11, 2022, 2:02 PM

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can yall help me with 2 more question

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i have 2 question left to finish this homework and it's hard

red nacelle Dec 11, 2022, 2:06 PM

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tulip roost can yall help me with 2 more question

yes go ahead

tulip roost Dec 11, 2022, 2:06 PM

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they didn't even put a video for help 😕

red nacelle Dec 11, 2022, 2:07 PM

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tulip roost

Use the diagram and see where they overlap, find x and y

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Basically it's where the two lines overlap

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Look for x by going up

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And y is the horizontal bit

tulip roost Dec 11, 2022, 2:07 PM

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this is where they overlap right?

red nacelle Dec 11, 2022, 2:08 PM

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x = 1.6
y = 1.8

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Yes.

tulip roost Dec 11, 2022, 2:08 PM

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and second one

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with the axes

red nacelle Dec 11, 2022, 2:08 PM

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tulip roost

With the second bit subsitute the numbers Into the equation 1/4x+5 and the other one

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Join the points together

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Se3 where they overlap

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*See

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And find x and y

tulip roost Dec 11, 2022, 2:11 PM

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its confusing

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wait soo find x and y

red nacelle Dec 11, 2022, 2:11 PM

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Plot that and see where they overlap to see x and y

tulip roost Dec 11, 2022, 2:13 PM

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can you do it please it just impossible for me

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i don't get anything of this stuff and normally you learn this in year 10 or 11

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defo not in year 9

red nacelle Dec 11, 2022, 2:21 PM

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You start simulations equations in the year 9 syllabus, the course begins in year 9

tulip roost Dec 11, 2022, 2:21 PM

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i didn't start it

red nacelle Dec 11, 2022, 2:21 PM

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tulip roost can you do it please it just impossible for me

Plotting graphs from a given equation is a year 7 skill

tulip roost Dec 11, 2022, 2:21 PM

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i didn't do year 7 in england

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i moved in year 8 to england

red nacelle Dec 11, 2022, 2:21 PM

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Oh right.

tulip roost Dec 11, 2022, 2:22 PM

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can you plot it for me please?

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i just need those 2 question and i'm done with this homework

red nacelle Dec 11, 2022, 2:25 PM

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x = -2
y = 4.5

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If you substitute those values in theh are the same for both questions so the answer is correct

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So x = -2, y = 4.5

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Done

tulip roost Dec 11, 2022, 2:27 PM

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it's correct

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thank you soo much

red nacelle Dec 11, 2022, 2:27 PM

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Yes

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No worries

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🙂

past pendant Dec 11, 2022, 2:28 PM

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celest urchin lol i totally wasn't sat working out thsi question by trial and error insteas of...

I got it but i was playing roblox at the same time so i was just a bit lost 😭

tulip roost Dec 11, 2022, 2:29 PM

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past pendant I got it but i was playing roblox at the same time so i was just a bit lost 😭

yo bro

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for the question about robyn and his child the answer is 13?

past pendant Dec 11, 2022, 2:30 PM

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Noo

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42

tulip roost Dec 11, 2022, 2:30 PM

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ohh 42

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my bad

past pendant Dec 11, 2022, 2:30 PM

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ye

tulip roost Dec 11, 2022, 2:31 PM

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it says it's wrong

past pendant Dec 11, 2022, 2:31 PM

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hmmm

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Try

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@tulip roost Show me it saying its wrong

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Cause i just rechecked thw working out and it’s correct

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If u substitute x

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into the equation

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x+28+1=3(x+1)

tulip roost Dec 11, 2022, 2:33 PM

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i have a new question now

past pendant Dec 11, 2022, 2:33 PM

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13 + 28 + 1 = 3(13 + 1)

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42 = 42

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Bro it shod be correct

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??

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@neon crystal the thing is probably buggin out idk

past pendant Dec 11, 2022, 2:34 PM

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tulip roost i have a new question now

dam

tulip roost Dec 11, 2022, 2:34 PM

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past pendant Dec 11, 2022, 2:35 PM

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do the same

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x+26+1=3(x+1)

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x + 27 = 3x + 3

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3 and take away x

celest urchin Dec 11, 2022, 2:35 PM

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isn't it 41????

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13 + 28

past pendant Dec 11, 2022, 2:35 PM

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But it was after a year lol

celest urchin Dec 11, 2022, 2:35 PM

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ah

past pendant Dec 11, 2022, 2:36 PM

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Also

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13 x 3 isnt 41

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So it doesnt make sense

celest urchin Dec 11, 2022, 2:36 PM

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past pendant 13 x 3 isnt 41

you ok pal?

past pendant Dec 11, 2022, 2:36 PM

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I think the thing was just bugging

past pendant Dec 11, 2022, 2:36 PM

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celest urchin you ok pal?

Dude look

celest urchin Dec 11, 2022, 2:36 PM

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past pendant I think the thing was just bugging

x+28 when x = 13

past pendant Dec 11, 2022, 2:36 PM

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She’s 28 yrs older bro

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if x is 13 then she’s gonna be 41

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that’s why u add the additional 1

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to signifiy that both have aged one year

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so when you get x from the equation

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it’s 13

celest urchin Dec 11, 2022, 2:37 PM

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well according to that 42 is wrong sooo

past pendant Dec 11, 2022, 2:37 PM

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and when you reinput x into the equation

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look

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13 + 28 + 1 = 3(13 + 1)

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42 = 42

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so

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yh

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dunno man

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the thing is wrong

tulip roost Dec 11, 2022, 2:37 PM

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sparxmaths moments

past pendant Dec 11, 2022, 2:38 PM

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Sparx is buggy

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Lol

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But the questions are challenging sometimes so i like it

tulip roost Dec 11, 2022, 2:38 PM

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hate sparx

past pendant Dec 11, 2022, 2:38 PM

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tulip roost sparxmaths moments

Wait did u solve the other one

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so we had x + 27 = 3x + 3

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and then

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24 = 2x

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x = 12

tulip roost Dec 11, 2022, 2:38 PM

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wait

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let me try it

past pendant Dec 11, 2022, 2:39 PM

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12 + 26 is 38

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3(x + 1)= 38 + 1

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so

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12 + 1 = 39

tulip roost Dec 11, 2022, 2:39 PM

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thx bro

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hegarty better

#simultaneous equations