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Slope of a Line

If l1⊥ l2 a...

Question

If $l_{1} ⊥ l_{2}$ and the slope of $l_{1}$ is 1/2 then the slope of $l_{2}$ is _______

A

2

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B

-2

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C

1

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D

-1

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Solution

The correct option is B -2
Slope of a line perpendicular to a line of slope $m$ is $- \frac{1}{m}$
Hence, slope of line $l_{2} = - \frac{1}{\frac{1}{2}} = - 2$

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