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Math Help - Simultaneous Equations!

  1. #1
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    Simultaneous Equations!

    How do you simultaneously solve
    y=-0.70x^2 +30
    y=7


    Apparently you get the square root of 230/7, but I dont know how to get there.
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  2. #2
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    Re: Simultaneous Equations!

    y=-0.70x^2 +30--(1)
    y=7--(2)
    substitude (1) to (2), 7=-0.70x^2 +30
    0.70x^2= 23
    x10, 7x^2=230
    x^2= 230/7
    x= square root of 230/7
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  3. #3
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    Re: Simultaneous Equations!

    Ans :- y = -0.70x^2 + 30
    y + 0.70x^2 - 30 = 0
    0.70x^2 + y - 30 = 0
    0.70x^2 + 7 - 30 = 0
    0.70x^2 - 23 = 0
    0.70x^2 = 23
    x^2 = 23/7*10
    x^2 = 230/7
    x = sqrt 230/7

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