from rd sharma ch 10 .4 qus. 9
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First line's slope = m

Middle line (perpendicular to first line) has slope = -1/m  (change sign and flip fraction)

Second line is perpendicular to middle line, so we take the slope of the middle line (-1/m) and change the sign and flip the equation, so it becomes +m/1 or just m.

The first line and the second line have the same slope (m), so they are parallel.
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