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8 November, 04:00

8 kg of potatoes and 5 kg of carrots cost $28 whereas 2 kg of potatoes and 3 kg of arrot cost $11.20. what is the cost of 1 kg of each item

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  1. 8 November, 06:48
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    1 kg of potatoes costs x, 1 kg of carrots costs y.

    8x+5y=28 | : (-4)

    2x+3y=11,2

    -2x-1,25y=-7

    2x+3y=11,2

    3y-1,25y=11,2-7

    1,75y=4,2

    y=2,4

    1 kg of carrots costs $2,4.

    1 kg of potatoes costs:

    2x+3*2,4=11,2

    2x+7,2=11,2

    2x=11,2-7,2

    2x=4

    x=2

    1 kg of potatoes costs $2
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