## Algebra 1

$12x+15y = 120$ Thee combinations: no shirts and 8 sweatshirts, 10 shirts and no sweatshirts, 5 shirts and 4 sweatshirts
12 per shirt, 15 per sweatshirt, 120 to spend $12x+15y = 120$ Let x = 0: $12*0 + 15y = 120$ $15y = 120$ $15y/15 = 120/15$ $y = 8$ Let y = 0: $12x + 15*0 = 120$ $12x = 120$ $12x/12 = 120/12$ $x = 10$ Let x = 5: $12*5 + 15y = 120$ $60 + 15y = 120$ $60 + 15y -60 = 120-60$ $15y = 60$ $15y/15 = 60/15$ $y =4$