Respuesta :

Sure you do. 

y = -8x
2x + 4y = 0

Substitution method 

2x + 4(-8x) = 0
2x + -32x = 0
-30x = 0
x = 0

Now substitute to find y 

y = -8x 
y = -8(0)
y = 0

So both are 0
0  is the c o r e c t  a n s w e r