Question

Help me find the solution to these equations please. And explain.
2x - y = 11
3x + 4y = 0

Answer 1

Multiply your top equation so that the y's are the same in both equations. Then add the equations together.

Answer 2

@DarronW not allowed to do that. I have to use substitution.

Answer 3

ok then for sub you need to decide if you want to sub x or y

Answer 4

I tried both. Can you help me work through it?

Answer 5

2x-y=11
I would use y
2x-y=11
-2x -2x to both sides
-y=11-2x
then I would divide both sides by -1
y=-11+2x

Answer 6

sub this into your second equation to solve for y

Answer 7

then take your y value and sub it in either equation to solve for x

Answer 8

Why would you divide both sides by -1?

Answer 9

@precal

Answer 10

because
-y
is not the same
as
y

Answer 11

And it always needs to be in the form of y?

Answer 12

yes + y

Answer 13

So I did that and got to 11x = 4. Now I don't know what to do. I can't have any fractions/decimals

Answer 14

3x + 4y = 0
3x+4(-11+2x)=0

Answer 15

you did it like this, correct?

Answer 16

Oops I should've gotten 11x + -44 = 0 right?

Answer 17

x=4 ?

Answer 18

x = 4, y = -3, you're right on track.

Answer 19

sorry, I don't like to skip steps

Answer 20

Okay I found the correct answer then. I combied 8x and 3x precal

Answer 21

Sorry I'm being vague, just trying to work quickly

Answer 22

not a problem, you should show all of your steps. It is easy to make mistakes when you are vague......

Answer 23

Thank you very much. If I have another problem, I will tag you in it if that's okay.

Answer 24

ok, I don't know how long I will be online but If I can help you I will