y = 8-5x
Explanation:
When two lines are parallel, it means their gradients are the same.
from the given equation
y = 9-5x
and comparing with the general equation of a line
y = mx+c, where m is the gradient, and c is the y-intercept,
m = -5
you can form a line parallel to that using the points (0,8)
(y-8)/(x-0)= -5
this would give you
y = 8-5x