Joel bought 8 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?
A. 4x + 4y = 8 and 17x + 13y = 128
B. x + y = 13 and x + 17y = 128
C. x + y = 17 and 13x + y = 128
D. x + y= 8 and 13x + 17y = 128

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Okay, we know A isn't right because it doesn't make sense with the question

I want us to take a look at D.

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