SAT Math Practice Question #10170 - SATify | SATify

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SAT Math Practice Question #10170 - SATify | SATify

#10170

linear equations

coordinate geometry

slopes

medium

45 sec

In the $x y$ -plane, line $a$ has the equation $- 5 y + 10 x = 15$ . If line $b$ is perpendicular to line $a$ , what is the slope of line $b$ ?

A.

$2$

B.

$- \frac{1}{2}$

C.

$\frac{1}{2}$

D.

$- 2$