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Yes if x=2 and y=2, then x=y
The solution of y-x=2 is a line through the points (0,2) and (-2,0).
It is x^2 + xy + y^2
There is one solution for x and one solution for y. The solution is: x = -1 ; y = 2
Yes, 0, 2 is a solution to y=-x+2 because 0=-2+2 which can be rewritten as 2-2=0.