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March 25, 2017

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Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class raised total of 160 bucks, how many coins of each type was collected?

it says i have to solve this by the elimination method, and i cant seem to figure out.

  • Math - ,

    Let x = number of $1 coins and y = number of $2 coins.

    x = 5y - 8
    x - 5y = -8

    x + 2y = 160

    Multiply first equation by 2 and second by 5.

    2x - 10y = -16
    5x + 10y = 800

    Add the two equations.

    7x = 784
    x = ?

    Put value of x in first equation to find y. To check, put both values into the second equation.

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