Answer
$y = -1.5$
Work Step by Step
$3x-4y = 12$
If $x=2$ then substitute $x$ value in the given statement.
$3(2)-4y = 12$
$6-4y = 12$
$-4y = 12-6$
$-4y = 6$
$\frac{-4y}{-4}= \frac{6}{-4}$
$y = \frac{-6}{4}$
$y = \frac{-3}{2}$
$y = -1.5$