Posted by lisa on Wednesday, February 8, 2012 at 8:02pm.
Suppose that you can spend $72 for compact discs and videos. Discs cost $18 and videos cost $9 each. write a system of inequalities that shows the various number of discs and videos that you can buy.

algebra  PsyDAG, Thursday, February 9, 2012 at 10:58am
18x + 9y ≤ 72
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