x^2+y^2=20

2y-x=0

simultaneous equations- started but doing something wrong.

please help

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- Nov 17th 2007, 06:26 AM #1

- Joined
- Oct 2007
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- Nov 17th 2007, 06:29 AM #2
From the second equation $\displaystyle x=2y.$

Substitute that into the first equation, then solve for $\displaystyle y,$ after that you'll get the values for $\displaystyle x.$

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A related problem has been posted not long ago, let me find it and I'll edit my post. (Here is it. It's the same procedure.)

- Nov 17th 2007, 06:31 AM #3