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8 March, 05:39

Uncle Ian spent $59 at a book store. He bought science fiction and mystery novels. The science fiction novels cost $7 apiece and the mystery novels cost $9 apiece. If uncle Ian bought 7 novels, how many of each type did he buy?

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Answers (2)
  1. 8 March, 06:06
    0
    3 and 4 are the right
  2. 8 March, 07:37
    0
    2 science fiction and 5 mystery

    Step-by-step explanation:

    First, we will set up a system of equations.

    x (science fiction) y (mystery)

    x + y = 7 This is the total books bought.

    7x + 9y = 59 The amount of each set to the total cost.

    Now we solve.

    (-7) x + y = 7 equals

    -7x - 7y = - 49

    added to

    7x + 9y = 59

    this equals

    2y = 10

    y = 5

    Now we know one. We can plug it in to find the other value.

    x + 5 = 7

    x = 2
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