You'd answer as if you were solving for y in an equation, so:
2x + 3y = 6
- 2x
3y = 6 - 2x
- 6
3y - 6 = -2x
+ 6
3y = -2x + 6
÷ 3
y = -2/3x + 2
As that is not an option, I'd choose 3y = -2x + 6 as the answer, because it is still correct. I hope this helps!