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Mathematics 14 Online
OpenStudy (anonymous):

Solve the system of equations algebraically: { x^2+y^2+2x-4y=20 { 3x+4y=5

OpenStudy (anonymous):

I can't figure which variable I should cancel out. If I substitute 4y=5-3x back into the equation, I'm still left with x^2 and y^2.

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