SOLUTION: A music store is selling compact disks for $11.50 and $7.50. You buy 12 disks and spend a total of $110. How many compact disks that cost $11.50 did you buy?

Question 388392: A music store is selling compact disks for $11.50 and $7.50. You buy
12 disks and spend a total of $110. How many compact disks that cost
$11.50 did you buy?

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the number of $11.50 disks, B the number of $7.50 disks,
1.
.
.
.

2.
Multiply eq. 1 by (-15) and add to eq. 2,

Then from eq. 1,

.
.
.
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