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Student Support Forum: 'Solving a pair of equations' topicStudent Support Forum > General > "Solving a pair of equations"

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FD
12/20/11 06:48am

Hi all,

I'm having trouble solving a problem that feels like it should be fairly simple to achieve in Mathematica.

I have 'x(a,b)' and 'y(a,b)' and want to eliminate 'a' to get 'b(x,y)'. So far I have defined my variables:

x = (1/2)*((1 + a)^2 + 3*(1 - a)^2 +
12*b^2)/(2*(1 + a)^2 + (1 - a)^2 + 4*b^2)

y = (1/7)*(2*(1 + a)^2 + (1 - a)^2 + 4*b^2 +
9*(1 - a^2))/(2*(1 + a)^2 + (1 - a)^2 + 4*b^2)

However, every time I attempt to use "Solve", I get {{{}}} returned!

Any ideas?

FD

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Subject (listing for 'Solving a pair of equations')
Author Date Posted
Solving a pair of equations FD 12/20/11 06:48am
Re: Solving a pair of equations Peter Pein 12/21/11 4:02pm
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