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Math Help - Systems of Linear Equations - Elimination

  1. #1
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    Systems of Linear Equations - Elimination

    Ok. Got what should be a simple problem here but it has me confused and annoyed.
    Supposed to be solving by elimination method.

    <br />
5x{+}2y{=}11<br />
    <br />
7x{+}8y{=}7<br />
    I worked on solving this with what I know so far and I come up with pretty ugly fractions. Im thinking that there is something that I am missing and could use a little help here.
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  2. #2
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    Quote Originally Posted by sjgerman View Post
    Ok. Got what should be a simple problem here but it has me confused and annoyed.
    Supposed to be solving by elimination method.

    <br />
5x{+}2y{=}11<br />
    <br />
7x{+}8y{=}7<br />
    I worked on solving this with what I know so far and I come up with pretty ugly fractions. Im thinking that there is something that I am missing and could use a little help here.
    multiply the first equation by -4 to eliminate the y-terms.

    yes, the solutions are "ugly" fractions ... can't change that fact.
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  3. #3
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    Quote Originally Posted by sjgerman View Post
    <br />
7x{+}8y{=}7<br />
    I worked on solving this with what I know so far and I come up with pretty ugly fractions.
    Are you sure that's not 7x + 8y = 5 ?
    Would result in x = 3 and y = -2 so no "ugly fractions"
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  4. #4
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    Yep. I got all my homework done and then I checked the answers in the back of the book. It was right.

    I hate that I don't know this stuff at my age but I never even took algebra in high school and now 18 years later I have to know it for college
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