SOLUTION: Please help me solve this equation by elimination: {{{ x^2+y^2=20 }}} {{{ 4x^2+y^2=68 }}}

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Question 565064: Please help me solve this equation by elimination:
+x%5E2%2By%5E2=20+
+4x%5E2%2By%5E2=68+
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me solve this equation by elimination:
+x%5E2%2By%5E2=20+
+4x%5E2%2By%5E2=68+
----------------------- Subtract
-3x%5E2+=+-48
x+=+sqrt%2816%29