Answer:
y=15-x
Step-by-step explanation:
3y=45-3x
If you want to solve for y, you need another one equation
y = -x + 15
Subtract 3x from each side (left and right side of the equal sign) which will leave you with 3y = -3x + 45. Then divide everything by 3 which gets you
y = -x +15
