If the two straight lines $y = m_{1} x + c_{1}$ and $y = m_{2} x + c_{2}$ are perpendicular to each other then $m_{1} m_{2} =$ _____________

-1

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1/2

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Solution

The correct option is A -1
When two lines are perpendicular, the product of their slopes $= m_{1} m_{2} = - 1$

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