Answer:
y = 3x + 72
Explanation:
To solve for y, we can rearrange the equation to the form y = 3x + b, where b is a constant. To do this, we move the -9y to the left side of the equation and the 3x to the right side, which gives us -9y - 3x = 81. We can then divide both sides by -9, which gives us y = 3x + 72.