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Formula
slope = m = (y2 - y1) / (x2 - x1)
Data
x1 = -3 y1 = -4 x2 = -2 y2 = -8
Substitution
m = (-8 + 4) / (-2 + 3)
Simplification
m = -4/1
Result
m = -4
2) (-3, 8) and (3, 8)
m = (8 - 8) / (3 + 3)
m = 0/6
m = 0 Slope is Zero
3) (5 , 1) and (9, -7)
m = (-7 - 1) / (9 - 5)
m = -8 / 4
m = -2