can someone help me solve this please? | Mathematics | Page 1

heavy terrace Nov 21, 2022, 6:08 PM

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The simultaneous equations one?

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You need to make either x or y the same

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If you take a look which one would be easier to multiply to make them the same

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It can be negative and positive though (e.g. -4x +4x)

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That’s acceptable

fervent jacinth Nov 21, 2022, 6:10 PM

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I have done this so far

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rn_image_picker_lib_temp_51b355e1-83a8-4250-8407-5405d9fb4bda.jpg

heavy terrace Nov 21, 2022, 6:10 PM

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Why didn’t you just multiply the top one?

heavy terrace Nov 21, 2022, 6:10 PM

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fervent jacinth

By doing this you create more work for you to do

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It’s a common mistake dont worry

fervent jacinth Nov 21, 2022, 6:11 PM

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Okay

heavy terrace Nov 21, 2022, 6:11 PM

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Also if you have +3x and -3x

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What would you need to do to make it 0

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Add or subtract

fervent jacinth Nov 21, 2022, 6:12 PM

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Plus

heavy terrace Nov 21, 2022, 6:12 PM

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Yep

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So do that and see where it gets you

fervent jacinth Nov 21, 2022, 6:13 PM

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Do I plus 3x onto 2x

heavy terrace Nov 21, 2022, 6:14 PM

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Where do you have 3x and 2x

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I’ve solved the equation but I’ll walk you through it

fervent jacinth Nov 21, 2022, 6:15 PM

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I'm not sure i just thought because 2x in te question

heavy terrace Nov 21, 2022, 6:15 PM

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Yeah 2x is in the equation

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But you need to multiply the top equation

fervent jacinth Nov 21, 2022, 6:15 PM

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By 3?

heavy terrace Nov 21, 2022, 6:17 PM

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2

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3x2 is 6

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You’ll have 6y on both sides

fervent jacinth Nov 21, 2022, 6:18 PM

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Is that correct?

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I'm not sure if it is

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Do I leave the second one?

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heavy terrace Nov 21, 2022, 6:34 PM

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fervent jacinth

Hold on

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@fervent jacinth

fervent jacinth Nov 21, 2022, 6:35 PM

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Hi

heavy terrace Nov 21, 2022, 6:35 PM

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Why did you do 27x

fervent jacinth Nov 21, 2022, 6:35 PM

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Idk

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I just did

heavy terrace Nov 21, 2022, 6:35 PM

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here take a look at my model answer

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fervent jacinth Nov 21, 2022, 6:36 PM

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I sort of understand

heavy terrace Nov 21, 2022, 6:36 PM

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Which part do you not understand

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And i can help

fervent jacinth Nov 21, 2022, 6:37 PM

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I dont know what to do after you times it by 2

heavy terrace Nov 21, 2022, 6:37 PM

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Okay

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You have 2x + 3y = 20

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So

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2x + 3y = 20
5x -6y = 23

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That’s the question

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If you take a look at Y

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Its 3 and 6

fervent jacinth Nov 21, 2022, 6:38 PM

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rn_image_picker_lib_temp_f9df4c2c-6d3c-418f-890a-a6c0edbcabd2.jpg

heavy terrace Nov 21, 2022, 6:38 PM

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You can multiply 3 by 2 to get 6

fervent jacinth Nov 21, 2022, 6:38 PM

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I get up to here

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I don't understand after

heavy terrace Nov 21, 2022, 6:38 PM

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Add the 2 equations

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The y’s cancel each other out

fervent jacinth Nov 21, 2022, 6:38 PM

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9x = 63

heavy terrace Nov 21, 2022, 6:39 PM

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So you’re left with 4x = 40 and 5x = 23

heavy terrace Nov 21, 2022, 6:39 PM

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fervent jacinth 9x = 63

Exactly

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So you want x by itself

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So you want to rearrange the question

fervent jacinth Nov 21, 2022, 6:39 PM

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Do I divide by 9

heavy terrace Nov 21, 2022, 6:39 PM

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Equation*

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Yes

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You divide both sides by 9

fervent jacinth Nov 21, 2022, 6:39 PM

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X = 7

heavy terrace Nov 21, 2022, 6:39 PM

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Yes

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X = 7

heavy terrace Nov 21, 2022, 6:40 PM

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heavy terrace 2x + 3y = 20 5x -6y = 23

Now put that into the easiest equation between these two

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Substitute x for 7

fervent jacinth Nov 21, 2022, 6:41 PM

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So 14 + 3y = 20
20 - 14
3y = 6
y = 2

heavy terrace Nov 21, 2022, 6:41 PM

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Exactly

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X = 7
Y = 2

fervent jacinth Nov 21, 2022, 6:41 PM

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Thank you so much

heavy terrace Nov 21, 2022, 6:41 PM

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You can put that into the other equation to doublecheck

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5x7 - 6x2 = 23

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35 - 12 = 23

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Done

fervent jacinth Nov 21, 2022, 6:42 PM

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Thank you

heavy terrace Nov 21, 2022, 6:42 PM

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My pleasure

fervent jacinth Nov 21, 2022, 6:42 PM

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Have a good day/night

heavy terrace Nov 21, 2022, 6:42 PM

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I have a maths mock exam tomorrow so this helped

heavy terrace Nov 21, 2022, 6:42 PM

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fervent jacinth Have a good day/night

You too

fervent jacinth Nov 21, 2022, 6:43 PM

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Good luck

#can someone help me solve this please?