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Cost of 4 books and 5 pens is 32 and cost of 5 books and 4 pens is 31 then find the cost of 1 book B=?

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    answer choices?

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    4b + 5p = 32

    5b + 4p = 31

    Multiply first equation by 4 and second by 5.

    16b + 20p = 128

    25b + 20p = 155

    Subtract first from second and solve for b.

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