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Math Help - PROBLEM solving(complementary and supplementary) guys help!!

  1. #1
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    Unhappy PROBLEM solving(complementary and supplementary) guys help!!

    this is all about the complementary and supplementary angle..
    These are the problems I can't solve.. Can anyone explain how to solve this? Advance thanks..

    18. If the measure of an angle is (7x-13)degrees and the measure of it's supplement is (5x-11)degrees, find x.

    19. Find the measure of the smaller angle of complementary angles, if the measure of the larger angle is (5x+18)degrees and the measure of the smaller angle is half of the larger.

    21. Two complementary angles have the difference of 18degrees. Find their measures.
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  2. #2
    Senior Member Dinkydoe's Avatar
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    First of all, what is your problem exactly? 2 angles a,b are supplementary angles if a+b=180 degrees. And a,b are complementary if a+b= 90 degrees.
    Thus it boils down to basic algebra...

    18. solve (7x-13)+(5x-11)= 180 for x

    19. Solve (5x+18)+1/2(5x+18)= 90 for x and then find the value (5x+18) by plugging in x

    20 .....you can do this one.
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  3. #3
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    So the answer in 19 must be a fraction number?
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  4. #4
    Senior Member Dinkydoe's Avatar
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    So the answer in 19 must be a fraction number?
    Why not trying to solve the question first, before asking. Yes, x is a fraction number, but (5x+18) is not!
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