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10 April, 07:29

A shop sells one pound bags of peanuts for $2 and three pound bags of peanuts for $5. If 9 bags are purchased for a total of $36 how many one pound bags were purchases

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  1. 10 April, 07:37
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    X=number of 1lb bags

    y=number of 3lb bags

    2x+5y=36

    and

    x+y=9

    mulitply 2nd equation by - 2 and add to first equation

    2x+5y=36

    -2x-2y=-18 +

    0x+3y=18

    3y=18

    divide both sides by 3

    y=6

    sub back

    x+y=9

    x+6=9

    x=3

    there were 3 one pound bags bought
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