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SAT Math Practice Question #31511 - SATify | SATify

#31511

slopes

coordinate geometry

linear

medium

45 sec

Line $L_{1}$ has a slope of $m_{1}$ , and line $L_{2}$ has a slope of $m_{2}$ . Which of the following statements must be true if $L_{1}$ and $L_{2}$ are perpendicular and neither line is vertical?

A.

$m_{1} = m_{2}$

B.

$m_{1} + m_{2} = 0$

C.

$m_{1} \cdot m_{2} = - 1$

D.

$m_{1} / m_{2} = - 1$