Explanation

Given equation: 3x - 2y = 9

Substitute x = 5 into the equation:

3(5) - 2y = 9

15 - 2y = 9

Subtract 15 from both sides to isolate -2y:

-2y = 9 - 15

-2y = -6

Divide by -2 to solve for y:

y = -6 / -2

y = 3