Y 4x 2xy 0. X^2-xy-4x+4y. x 2 4xy 4y 2. x2+2xy+y2. jx2 - xy+y2 = 21, y2 - 2xy+15 = 0;.

Y 4x 2xy 0. X^2-xy-4x+4y. x 2 4xy 4y 2. x2+2xy+y2. jx2 - xy+y2 = 21, y2 - 2xy+15 = 0;.
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