x^2+y^2=25

y-x=1

and

x^2+y^2=5

xy=2

please help (Thinking)

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- April 15th 2008, 09:11 PMLVCamHelp with nonlinear systems!
x^2+y^2=25

y-x=1

and

x^2+y^2=5

xy=2

please help (Thinking) - April 15th 2008, 10:14 PMTwistedOne151
In both cases, solve the second equation for one variable in terms of the other, and then substitute into the first. For example, with:

we can solve the second for y:

and substituting into the first equation:

so x=3 or x=-4, and substituting into the second equation, we get y=4 or y=-3 respectively, so we have (3,4) and (-4,-3) as solutions.

The second can be solved similarly.

--Kevin C. - April 16th 2008, 07:05 AMLVCam
thanks twisted