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Math Help - f(x) problem (graphs)

  1. #1
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    f(x) problem (graphs)

    If f(x)=-2x+3 and g(x)= 1/2x -8, which statement is true?

    A) f(-2)-g(-2)=-2
    b) f(-2)-g(-2)= 2
    c) f(-2)+g(-2)=-2
    D) f(-2)+g(-2)=2

    Now i have no idea what to do here, if anyone could explain how they got the answer, it would be appreciated, thank you!
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  2. #2
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    u take -2 and place it in for x or x= -2 meaning about none of those options are correct...
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  3. #3
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    in the answers, it says it is C, so.. does anyone have anything else?
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  4. #4
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    Using Destiny666's approach I got that answer c) is correct.

    f(-2) + g(-2) = (-2(-2) + 3) + \left ( \frac{1}{2}(-2) - 8 \right )

    = (4 + 3) + (-1 - 8)

    = 7 + -9 = -2

    -Dan
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