Q10 of 112 Page 168

Slope of the straight line which is perpendicular to the straight line joining the points (–2, 6)and (4, 8)is equal to

The straight line is perpendicular to the straight line joining the points(–2, 6)and (4, 8).


The slope of line joining the points (–2, 6)and (4, 8) is m1.


i.e.


Now the perpendicular line will have the slope m2 and as


the product of the slopes of 2 perpendicular lines is –1.


m1×m2 = –1


⇒


⇒ m2 = –3

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