Question

Find the solution set of x.
9x>-36

Answer 1

Your multiplication property of inequality is key here: Dividing both sides by 9 (which is positive, so it will not reverse the inequality) would yield:
x > -4, so the solution set, in interval notaion is:
(-4, infinity)

Note that it is open at -4, meaning -4 itself is not in this solution set.

Answer 2

Divide both sides by 9, you get x>-4 so it looks like this: