Question

The tech club is selling cookies and brownies at the swim meet to raise money for next year's activities. If cookies sell for $0.50 and brownies sell for $0.75, what combinations of treats need to be sold to raise $100?

Answer 1

cookies=x
brownies=y
.5x+.75y=100
.5x=100-.75y
x=200-1.5y
400-3y+.75y=100
-2.25y=-300
y=133.333
x=0