Question 677531
xy-x^2=-20
x-2y=3
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x=2y+3
y(2y+3)-(2y+3)^2=-20
2y^2+3y-(4y^2+12y+9)=...
2y^2+3y-4y^2-12y-9=...
-2y^2-9y-9=-20
2y^2+9y+9=20
2y^2+9y-11=0
y=1, x=5
y=-11/2, x=-8
See below
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Ed
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*[invoke quadratic "x", 2, 9, -11]