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January 27, 2015

January 27, 2015

Posted by **lisa** on Thursday, October 13, 2011 at 9:01pm.

how do you do this ?

- algebra -
**MathMate**, Thursday, October 13, 2011 at 10:55pmIt would be the same way as you would do for linear simultaneous equations:

eliminate one of the variables. In this case, y is easy to eliminate.

3x^2+8x-10 = y = x^2+7x+5

Solve the resulting quadratic equation to get x=5/2 or x=-3.

As a check, substitute each of these values into the original equations to see if the values of y are equal.

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