A student has some $1 and $5 bills in his wallet. He has a total of 14 bills that are worth 50$. How many of each type of bill does he have?
+37159 x = $1 bills value = (1)(x) = x
14-x = $ 5 bills value = 5(14-x) summed, they equal $ 50
x + 5 (14-x) =50 solve for x (the number of $1 bills) then $5's = 14-x
