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Algebra 1

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The Everton college store paid 1519 for an order of 41 calculators. The store paid 9 for each scientific calculator. The other, all graphic calculators cost the store 55 each. How many of each type of calculators was ordered?. Thank you

  • Algebra 1 - ,

    Esther, check your 2-3-11,1:11am post.

  • Algebra 1 - ,

    X Scientific cal.
    Y Graphic cal.

    Eq1: X + Y = 41.

    Eq2: 9X + 55Y = 1519.
    Multiply both sides of Eq1 by -9:
    -9X - -9Y = -369,
    9X + 55Y = 1519
    Add the Eqs:
    46Y = 1150,
    Y = 1150 / 46 = 25 Graphic cal.

    X + 25 = 41,
    X = 41 -25 = 16 Scientific cal.

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