WeBWorK Standalone Renderer

You will purchase some CDs and DVDs. If you purchase $15$ CDs and $7$ DVDs, it will cost you ${\$86.60}$ ; if you purchase $7$ CDs and $15$ DVDs, it will cost you ${\$120.20}$ .

Write and solve a system equation to answer the following questions.

Each CD costs and each DVD costs .

You can earn partial credit on this problem.