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20 February, 10:45

Kristen spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7 then how many of each kind did she buy?

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  1. 20 February, 11:15
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    1 x + 1 y = 7 ... 1

    Total value

    15 x + 28 y = 131 ... 2

    Eliminate y

    multiply (1) by - 28

    Multiply (2) by 1

    -28 x - 28 y = - 196

    15 x + 28 y = 131

    Add the two equations

    -13 x = - 65

    / - 13

    x = 5

    plug value of x in (1)

    1 x + 1 y = 7

    5 + y = 7

    y = 7 - 5

    y = 2

    y = 2

    x = 5 plain shirts

    y = 2 fancy shirts
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