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    x²+y²=17
    3y+x=11


    help solving this plsssssss
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    Assuming you want to find the points of intersection.

    A standard technique is to eliminate one of the variables. In this case looking at your second expression, you can express y in terms of x, then substitute this into the first equation.

    You now have a quadratic in y, which can be factorised, but it's not the easiest one in the world.

    Then plug your y values back into the second equation to get the corresponding x values.
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    Don't forget those brackets when you sub the second equation into the first.
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    in first equation make either X or Y the subject then plug in to the second equation....
 
 
 
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Updated: March 22, 2009

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