Q. 123.6( 5 Votes )

#
A line passes through (x_{1}, y_{1}) and (h, k). If slope of the line is m, show that k – y_{1} = m(h – x_{1}).

Answer :

Let the points be A(x

_{1}, y

_{1}) and B(h, k)

Now m_{AB} =

and m_{AB} = m

Hence, = m

or k = y_{1} = m(h – x_{1}), which is the required result.

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