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math exam tommrow review

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find the solution of each equation if the replacement sets are x:{1,3,5,7,9} and y:{2,4,6,8,10}.

3x-9=12
y^2-5y-11=13

  • math exam tommrow review -

    3x-9=12
    3x = 12+9
    3x = 21
    x = 7 , which is a member of your solution set

    y^2 - 5y - 11 = 13
    y^2 - 5y - 24 - 0
    (y-8)(x+3) = 0
    y = 8 or y = -3

    only y=8 is a solution, since -3 is not part of your solution set.

  • math exam tommrow review -

    so i don't have to plug in each number?

  • math exam tommrow review -

    yes, you could do that.

    I don't know what grade level you are at.
    The second question involved solving a quadratic.
    If you don't know what that is, then plugging in each value of the replacement set would be your way of doing it.

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