Question 131878
x is the number of $10 CDs, y is the number of $15 CDs
10x+15y=55
one solution would be:
x=4 & y=1
10*4+15*1=55
40+15=55
another solution would be:
x=1 & y=3
10*1+15*3=55
10+45=55
55=55