Answer is in the graph attached
Step by step
y intercept = 7
slope = -8/5
y = -8/5 + 7
So first we graph y intercept, which is where the graph will cross the y axis, at 7
Then we use slope to make our next graph point. Since we know slope is y/x, or rise over run, we will count FROM Y INTERCEPT down - 8 and over or right 5 and mark your point.
Draw your line from point to point.
Problem solved!