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Show that the line through (2, 3) and (7, -7) is perpendicular to the line through (3, 3) and (-2, 2).
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If lines are perpendicular then the multiplication of their slopes = -1
line 1 slope = change in y/ change in x = (3--7)/2-7 = 10/-5 = -2
line 2 slope = 3-2/3--2=1/5
-2*1/5 = -2/5
The lines are therefore not perpendicular
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