Question

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

Answer 1

`y = 9 - 3x`

Explanation:

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

`3x - 3x + y = 9 - 3x`

`(3x - 3x) + y = 9 - 3x`

`0 + y = 9 - 3x`

`y = 9 - 3x`