In solving for the solution set of the inequality 15y - 9 < 36, much like any other algebraic equation, the first step should be to isolate y. This is done as follows:
15y - 9 < 36
Adding 9 to both sides of the equation:
15y - 9 + 9 < 36 + 9
15y < 45
Dividing both sides by 15 to isolate y:
15y/15 < 45/15
y < 3
Therefore the answer is the third choice y < 3.
