Q12 of 51 Page 10

A line passes through (x1, y1) and (h, k). If slope of the line is m, show that k – y1 = m(h – x1).


Let the points be A(x1, y1) and B(h, k)

Now mAB =

and mAB = m

Hence, = m

or k = y1 = m(h – x1), which is the required result.

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