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College Algebra

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Staples recently charged $17.99 per box of Pilot Precise rollerball pens and $7.49 per box for Bic Matic Grip mechanical pencils. If Kelling Community College purchased 120 such boxes for a total of $1234.80, how many boxes of each type did they purchase?

  • College Algebra -

    Let x = boxes of Pilot and y = boxes of Bic

    x + y =120 therefore

    x = 120 - y

    17.99x + 7.49y = 1234.8

    Substitute 120-y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation.

  • College Algebra -

    32 boxes of pilot and 88 boxes of Bic
    32x17.99 = 575.68
    88x 7.49 = 659.12
    total = 1234.80

  • College Algebra -

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