Q. 123.6( 5 Votes )
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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