How do you solve and check it

-5 - 5y = 0

y=8x

-5-5y=0

y=8x

substitute the value of y

-5-5 (8x) = 0

-5-40x=0

add 5 to both sides.

-40x=5

divide both sides by - 40

x=-5/40

simplify gcf=5

x=-1/8

checking:

Y=8x

y=8 (-1/8)

y=-1

Substitute it to the 1st equation

-5-5 (-1) = 0

-5+5=0

0=0