Question 42
What is the slope of the line perpendicular to the line passing through the points (-5 , 1) and (-2 , 0)?
Solution
Slope of the line passing through the points (-5 , 1) and (-2 , 0) = $$\frac{0-1}{-2+5}=\frac{-1}{3}$$
Let slope of line perpendicular to it = $$m$$
Also, product of slope of two perpendicular lines = -1
=> $$m\times \frac{-1}{3}=-1$$
=> $$m=(-1)\times(-3)=3$$
=> Ans - (B)
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