if 2,1 is a point and -20,-5 is another then:
y2-y1/x2-x1 is as follows: -5-1/-20-2 = -6/-22 = 6/22 = 3/11
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The slope is (6 - 1)/(1 - 2) = 5/(-1) = -5
slope = change_in_y/change_in_x = (2 - 5)/(0 - 1) = -3/-1 = 3
To find the slope use the equation m = (y(1) - y(2)) / (x(1) - x(2)) So forthe points (1,1) & ( 5, -1) We have m = (1 - - 1) / (1 - 5) m = 2 / -4 m = 1/-2 m = -1/2 or -0.5 is the slope .
Points: (1, 5) and (0, 2) Slope: 3
Points: (1, -2) and (3, -5) Slope: -3/2