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Math Help - Ordered pair

  1. #1
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    Ordered pair

    Can anyone tell me if the ordered pair (x,y) = (5.8,2.0) is a solution to the equation y = 4x - 21.2

    I would appreciate it if someone show me the best way to make this determination.
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  2. #2
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    Quote Originally Posted by YamahaR62002 View Post
    Can anyone tell me if the ordered pair (x,y) = (5.8,2.0) is a solution to the equation y = 4x - 21.2

    I would appreciate it if someone show me the best way to make this determination.
    substitute in 5.8 for x and 2.0 for y ... if the equation is true after the substitution, then the point is a valid solution.
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  3. #3
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    This is what I got:

    2 = 4(5.8) - 21.2
    2 = 23.2 - 21.2
    2 = 2

    So the answer would be: 2 is the ordered pair is a solution to the equation. Am I saying it right?
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  4. #4
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    Quote Originally Posted by YamahaR62002 View Post
    This is what I got:

    2 = 4(5.8) - 21.2
    2 = 23.2 - 21.2
    2 = 2

    So the answer would be: 2 is the ordered pair is a solution to the equation. Am I saying it right?
    not quite ...

    the ordered pair (5.8 , 2.0) is a solution to the equation y = 4x - 21.2

    the end equation 2 = 2 showed that the ordered pair (5.8 , 2.0) is a solution.
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  5. #5
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    Thank you very much. Aside from math, if I wanted to donate, where would the funds go, to you personally or Math Help Forum?
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  6. #6
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    Quote Originally Posted by YamahaR62002 View Post
    Thank you very much. Aside from math, if I wanted to donate, where would the funds go, to you personally or Math Help Forum?
    I receive no monetary compensation ... I do this because mathematics is a big part of my life.

    any donation goes entirely to MHF, not to any individual.
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  7. #7
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    Hi Skeeter-

    Could you just show me how to proceed forward with attached screenshot. Ordered pair-2672482617_b.jpg

    Please put me on the right track.

    Thanks!
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  8. #8
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    Hi there.

    The first value of the ordered pair is the x value, and the second is the y value. So to complete the ordered pairs in those questions you just need to replace the x in the equation with the value you are given, then solve this to find the y value.

    For the first one:

    y=\frac{4}{5}x+3

    so

    y=\frac{4}{5}\left ( 5 \right ) +3

    y=4+3

    y=7

    So the ordered pair would be \left ( 5, \ 7\right )

    Are you able to do the other ones now?
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