If you mean: y^2 + x^2 = 65 and y + x = 7 then the solutions are as follows:-
When y = -1 then x = 8
When y = 8 then x = -1
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7
7
(x - y + 7)(x + y)
Center is (0, 0) . . . the origin.Radius is 7.
The center of the circle is at (9, 7) on the Cartesian plane