# Given 3x+y=9 how do you solve for y?

Dec 14, 2016

$y = 9 - 3 x$

#### Explanation:

Subtract $3 x$ from each side of the equation to isolate $y$ and keep the equation balanced:

$3 x - 3 x + y = 9 - 3 x$

$\left(3 x - 3 x\right) + y = 9 - 3 x$

$0 + y = 9 - 3 x$

$y = 9 - 3 x$