You can see it is going up 5 and right 10. The slope would be 5/10 (or 1/2).
Since we need to go left 100 units because the x-intercept is (100,0), we will need to repeat the down 5 left 10, 10 times.
-5*10/-10*10 = -50/-100. We will go down -50 times and left -100 which would hit the y-axis. The y-intercept would be -50.
f(x) or y = 1/2x - 50
Double check your work.
y = 1/2 (100) - 50
y = 50 - 50
y = 0 √