Question

Solve the system of equations by using the substitution method.
18x-6y=4
x+y=0
I tried substituting the second equation into the first one, but my answer was wrong. Please help. Thanks!

Answer 1

what variable did you substitute?
what equation did you use to substitute? ( yes i know you used the 2nd equation but you can just use it as is)

any way you can show your work?

Answer 2

cant*

Answer 3

I put y=x+0 in the first equation, then multiplied as normal and I came out with a decimal.

Answer 4

ok, thats where you made your mistake

if we take the 2nd equation

x+y=0

and solve for "y"

that would mean we would have to subtract x from both sides

x+y = 0
x+y - x = 0 -x

and we would get y= -x instead of y=x