Question 77189
Solve for x and y: 
x*2 + y = 7
x + y*2 = 11 
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Try using substitution:
y=7-x^2
x + (7-x^2)^2=11
x + 49 -14x^2+ x^4 = 11
x^4-14x^2+x+38=0
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Using synthetic substitution you can find that
x=2 is the only integer solution.
If x=2, y=3
Cheers,
Stan H.