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March 27, 2017

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box of chalk and 2 staplers cost $10.00. Three boxes of chalk and 2 staplers cost $18.00. How much is a box of chalk and a stapler?

  • math - ,

    x is box of chalk
    y is staplers

    x + 2y = 10
    3x + 2y = 18

    solve for x and then plug in and solve for y

  • math - ,

    x+2y=10
    3x+2y=18
    Multiply the first equation by -1 to cancel the y's:
    -x-2y=-10
    3x+2y=18
    Now add the rows
    2x=8
    x=?
    Now plug that back into either original equation to solve for y.

  • math - ,

    16

  • math - ,

    the answer is

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