Question

I really need help. Solving Systems with Substitution

y=2x
x+y=(-9)

Answer 1

Explanation:

If you let y=2x, you can plug it into the other equation.

x+2x=-9

Then solve that equation.

3x=-9

x=-3

Then use y=2x to find y.

y=2(-3)=-6

y=-6