x+y=2 the gradient is -1
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x2 - y2 + 9x - 9y =(x2 + 9x) - (y2 + 9y) =x(x + 9) - y(y + 9)================================Another way to go after it:x2 - y2 + 9x - 9y =(x2 - y2) + 9x - 9y =(x + y) (x - y) + 9 (x - y) =(x + y + 9) (x - y)
(x - y)(x + y)(x2 - xy + y2)(x2 + xy + y2)
X = y2 =====
(x-2)^2+y^2=64
y2=-x2-8x+6