y = -x - 8
y = 2x/5 - 1
Method
for both equation, substitute x = 0 and find y, then y = 0 and find x.
For y = -x - 8
when x = 0, y = -0-8 = -8
when y = 0, 0 = -x - 8
x = -8
For y = 2x/5 - 1
when x = 0, y = -1
when y = 0, x = 5/2 = 2.5
The solution to the system of equations is x = -5 and y = -3.