SOLUTION: Simultaneous equations- one linear one quadratic Xsquared+ysquared=20 X-2y=0

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Question 998042: Simultaneous equations- one linear one quadratic
Xsquared+ysquared=20
X-2y=0

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
From x%5E2+%2B+y%5E2+=+20 and
x - 2y = 0
Solve the second one and substitute into the first one and get
x = 2y so that
%282y%29%5E2+%2B+y%5E2+=+20
4y%5E2+%2B+y%5E2+=+20
5y%5E2+=+20
y%5E2+=+4
y = 2, -2
For y = 2, x = 4
For y = -2, x = -4