Need help with Solving Two Variable Systems with Substitution | Mathematics | Page 1

glad pierBOT Nov 7, 2022, 10:56 AM

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winged badger Nov 7, 2022, 10:56 AM

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shadow coral Nov 7, 2022, 10:58 AM

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3x+y=3

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y=3-3x

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substitute for y in the 2nd equation

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2x - 5(3-3x) = 6

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2x - 15 - 15x = 6

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-15 - 13x = 6

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13x = 21

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x = -21/13

winged badger Nov 7, 2022, 11:02 AM

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So is the solution -21/13 or is it another equation, because I believe on another similar question I put in the value of x but it was wrong and it was instead something like y=something + something

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Thanks for the step by step help.

honest dawn Nov 7, 2022, 11:03 AM

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wait it is wrong

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3x+y=3
y=3-3x
substitute for y in the 2nd equation
2x - 5(3-3x) = 6
2x - 15 + 15x = 6
-15 + 17x = 6
17x = 21
x = 21/17

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this is correct

winged badger Nov 7, 2022, 11:05 AM

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Welp,

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Apparently it was this

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shadow coral Nov 7, 2022, 11:05 AM

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bro

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ur question

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is to write

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x in terms of y

winged badger Nov 7, 2022, 11:06 AM

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I'm just trying to understand how to get -1/3y+1

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How the hell is that the answer

shadow coral Nov 7, 2022, 11:06 AM

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its simple

winged badger Nov 7, 2022, 11:06 AM

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I'm not good at math

shadow coral Nov 7, 2022, 11:06 AM

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3x + y = 3

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so 3x = 3+y

winged badger Nov 7, 2022, 11:06 AM

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Oh wait

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Divide by 3

shadow coral Nov 7, 2022, 11:07 AM

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and x = (3+y)/3 = (y/3) + 1

shadow coral Nov 7, 2022, 11:07 AM

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honest dawn 3x+y=3 y=3-3x substitute for y in the 2nd equation 2x - 5(3-3x) = 6 2x - 15 + 1...

oops minus

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sry

winged badger Nov 7, 2022, 11:07 AM

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Ok, thanks for the help

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honest dawn Nov 7, 2022, 11:12 AM

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no solution

winged badger Nov 7, 2022, 11:12 AM

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Why does it have no solution?

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You were right, but I still wanna know

honest dawn Nov 7, 2022, 11:13 AM

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because the x and y have ration but their constant have no ratio

winged badger Nov 7, 2022, 11:13 AM

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I will pretend I understand

honest dawn Nov 7, 2022, 11:13 AM

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wait

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you can write first equation as 6x -2y -10=0

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and second equation as 6x -2y +15=0 (multiplying by 2)

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from here you can see that whatever value you put there will be no solution

winged badger Nov 7, 2022, 11:16 AM

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I need to get a math solver/tutor bro

honest dawn Nov 7, 2022, 11:16 AM

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heheh

winged badger Nov 7, 2022, 11:16 AM

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Hey can you help me with one last question?

honest dawn Nov 7, 2022, 11:16 AM

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ok

winged badger Nov 7, 2022, 11:16 AM

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Thanks

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honest dawn Nov 7, 2022, 11:16 AM

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in which grade are you?

winged badger Nov 7, 2022, 11:16 AM

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Technically,

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I'm not in any grade

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But this is highschool level algebra I think

honest dawn Nov 7, 2022, 11:16 AM

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dropout?

winged badger Nov 7, 2022, 11:17 AM

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I got a whole backstory,

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And idk if I wanna post it here

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Maybe in DMs

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Just not here for the whole public to see

winged badger Nov 7, 2022, 11:17 AM

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honest dawn dropout?

Essentially

honest dawn Nov 7, 2022, 11:17 AM

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can you send friend request

winged badger Nov 7, 2022, 11:17 AM

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Sure

honest dawn Nov 7, 2022, 11:18 AM

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option c

winged badger Nov 7, 2022, 1:35 PM

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.close

glad pierBOT Nov 7, 2022, 1:35 PM

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Solved

Post marked as solved by @winged badger.

Use .unsolved if this was a mistake.

#Need help with Solving Two Variable Systems with Substitution