sarah bought t-shirts and hats on sale. the t-shirts cost $12 each, and the hats cost $9 each. she bought 4 more t-shirts than hats. if she spent a total of $111, how many t-shirts and hats did she buy?

12t + 9h = 111
t = h + 4

12(h + 4) + 9h = 111
distribute the 12

12h + 48 + 9h = 111
Combine like terms

21h + 48 = 111
Subtract 48 from both sides

21h = 63
Divide both sides by 21

h = 3
t = 7

CHECK: 3(9) + 7(12) =
27 + 84 =
$111

Solve the following for h and t, the number of hats and T shirts respectively: {9 h + 12 t = 111, t - 4 = h} h = 3 and t = 7