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4 January, 22:13

the cost of 6 sandwhiches and 4 drinks is $53. the cost of 4 sandwhiches and 6 drinks is $47. how much does one sandwhich cost

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  1. 4 January, 23:18
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    6s+4d=$53

    4s+6d=$47

    Multiply 6 in the first equation which is

    36s+24d=$318

    Multiply - 4 in the second equation which is

    -16s-24d=$-188

    Then ...

    36s+24d=$318

    -16s-24d=$-188

    You cancel out the - 24d and + 24d

    36s=$318

    -16s=$-188

    Do the math ...

    20s=$130

    Divide 20 by both sides and answer ...

    s=$6.5
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