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Math Help - finding quadratic

  1. #1
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    finding quadratic

    I need to find any quadratics that are tangent to y=-5x-10, y=-3x-7 and to y=x-7 given that the y intercept = c-(m-b)^2/4a.

    I figure I can work out m for each above and sub into the y intercpet formula and I am given the y intercept in all three cases.

    But form there I get lossed in the algebra. I don't know the technique of solving 3 equations with 3 variables.

    Any help is greatly appreaciated.
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  2. #2
    Eater of Worlds
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    Is that y intercept \frac{c-(m-b)^{2}}{4a} or

    c-\frac{(m-b)^{2}}{4a}?.
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  3. #3
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    the second, sorry for not being clear
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