number of dimes - x
number of nickels - y
x+y = 132 /*-10 -----> -10x-10y = -1320
10x + 5y = 950
-10x-10y = -1320
10x + 5y = 950
-5y = - 370
y = 74 number of nickels
x+y = 132
x + 74 = 132
x= 132-74
x = 58 number of dimes
Check:
10*58 + 5*74 = 950
950 = 950 True
