Data:
t: number of hours
y: earnings
earn more than $44

He charges $6 per hour (6t) and pays $4 (-4) in equipment fees:

Then, you get the next inequality:

To find the number of hours Trey could trim trees solve the inequality for t:
- Add 4 in both sides of the inequality:

- Divide both sides of the inequality into 6:

Then, Trey needs to trim tress for more than 8 hours to earn more than $44