Joel bought 88 books. Some books cost $13 each and some cost $17 each. In all, he spent $128. Which

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Joel bought 88 books. Some books cost $13 each and some cost $17 each. In all, he spent $128. Which system of linear equations represents the given situation?

Let a be the number of the $13 book, and b equal the number of $17 books. We have the following system of linear equations:

1. a + b = 88
2. 13a + 17b = 128

To solve this system, use our calculator for the following methods:

• Substitution
• Elimination
• Cramers Method