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Math Help - solve equation

  1. #1
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    solve equation

    see attachment to save my life....
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  2. #2
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    Quote Originally Posted by jeilynn View Post
    see attachment to save my life....
    Hello, jeilynn,

    I would choose B because

    - you can easily solve the second equation for x: The coefficient of x is (+1)
    - you can substitute the term for x in the first equation

    5x + 3 y = 3
    x + 9y = 2 ==> x = 2 - 9y

    5(2-9y) + 3y = 3

    10 - 45y + 3y = 3
    -42y = -7

    y = 1/6 Now substitute this result into the equation which expresses x:

    x = 2 - 9*(1/6) = 2 - 3/2 = 1/2
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