Find the slope of a line perpendicular to a line whose slope is 1.

-1

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-2

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Solution

The correct option is A
-1

If two lines are perpendicular, their product of slopes is equal to - 1.
So, here $m_{1} = 1$ and $m_{2} = ?$
$m_{1} \times m_{2} = - 1$
$1 \times m_{2} = - 1$
$m_{2} = - 1$

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