Need urgently matter of life and death

you can work no more than 60 hours each week at your two jobs. dog walking pays $7 per hour and your sales job at computers & more, inc. pays $12 per hour. you need to earn at least $450 each week to pay your bills. your friend solves the system of inequalities and tells you that a possible solution is (-3, 50). is this a possible solution, why or why not?