Nine books

Nine books are to be bought by a student. Art books cost $6.00 each and biology books cost $6.50 each . If the total amount spent was $56.00, how many of each book was bought?

Correct answer:

a =  5
b =  4

Step-by-step explanation:

a+b = 9
6a + 6.5b = 56.00

a+b = 9
6•a + 6.5•b = 56.00

a+b = 9
6a+6.5b = 56

a = 5
b = 4

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