To answer this question properly, you must have 2 points through which the line passes.
If another point is (0,0), then the slope of the line is
-16 - 0
m = -------------- = 2
-8 - 0
If another point is (17.5, 34), then
34 -(-16) 50
m = ------------------ = ------------- = 24.5
17.5 - (-8) 25.5