algebra

a+7b=17, a+2b=2

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  1. a + 7b = 17

    -

    a + 2b = 2
    __________

    ( a - a ) + ( 7b - 2b ) = 17 - 2

    5b = 15 Divide both sides by 5

    b = 15 / 5 = 3

    a + 7b = 17

    a + 7 * 3 = 17

    a + 21 = 17 Subtract 21 to both sides

    a + 21 - 21 = 17 - 21

    a = - 4

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