Name: SAT Math Help & School Math Mastery
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#11442

linear equations

systems

hard

75 sec

$x + 3 y = 1$ and $a x + b y = 1$
In the given pair of equations, $a$ and $b$ are constants. The graph of this pair of equations in the $x y$ -plane is a pair of perpendicular lines. Which of the following pairs of equations also represents a pair of perpendicular lines?

A.

$2 x + 3 y = 1$ and $a x + 2 b y = 1$

B.

$2 x + 3 y = 1$ and $a x + b y = 1$

C.

$x + 3 y = 1$ and $a x + 2 b y = 1$

D.

$2 x + 6 y = 1$ and $a x + 2 b y = 1$