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Math Help - Simultaneous Equation Help Please!

  1. #1
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    Simultaneous Equation Help Please!

    y=2x+3
    x+y=2

    i get

    x+(2x+3)=2 then,
    x+(2x+3)(2x+3)=2 then,
    x+4x+12x+9=2

    Then im stuck i realise it's a quadratic equation (4x+12x+9) but i don't know where to go from here.

    Help greatly appreciated x
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  2. #2
    Moo
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    Hello,

    (4x+12x+9)

    this is equal to:

    (2x)+2*3*2x+3

    If a=2x and b=3

    You have a+2ab+b, which is (a+b)
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  3. #3
    o_O
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    Move everything to one side:

    5x^{2} + 12x + 7 = 0

    Factor and see what you get
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  4. #4
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    thanks
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