Question

Solve the system by subsitution
x-3y=4
2x-6y=8

Answer 1

x - 3y = 4
2x - 6y = 8


x = 3y + 4
substitute in the second equation and solve for y, and then plug the value of y back in and evaluate for x.

Answer 2

^Do that.

Answer 3

I'll help you further if you don't understand.

Answer 4

I need a little more help.

Answer 5

Okay, I'll walk you through it.


x = 3y + 4

So in this equation:

x - 3y = 4

You replace x with 3y + 4.

Answer 6

Do you understand now?

Answer 7

He means in this 2x-6y=8 one
you replace the x with 3y + 4

Answer 8

Okay...
I don't think this is right but I got x=4, y=0

Answer 9

I'll show you.

Answer 10

x - 3y = 4
(3y + 4) - 3y = 4
3y + 4 - 3y = 4
4 = 4

Answer 11

2x - 6y = 8
2(3y + 4) - 6y = 8
6y + 4 - 6y = 8
4 = 8
?? This is false, so it can't be (3y + 4) unless there are no real solutions.

Answer 12

Oh, okay. I see my mistake. Thanks once again!

Answer 13

No problem.