show that the points (1, -1) , (5, 2) and(9, 5) are collinear
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Slope of 1 and 1 point=Slope of 2 and 3 point
y2-y1/x2-x1=y2-y1/x2-x1
2-(-1)/5-1 = 5-2/9-5
3/4=3/4
proved
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