Question 846293
y=2x
3x+3y=-18 
Y=?
X=?


Since y is already isolated, just plug it in the second equation to find x.

3(x) + 3(2x) = -18
3x + 6x = -18
9x = -18
x = -2 

X is equal to -2. So just plug and chug in order to find y. 

y = 2(x)
y = 2(-2)
y = -4