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.
Some books cost 13 dollars, so it could be 13x . Some books cost 17 dollars also. so it could be 13x + 17y = 128. some of his books are from x and some are y. Since we don't know how many books are from x and y, you would have to input x + y = 8