It must be a mistake. The only two points that satisfy the equation are (0, 1) and (1, 0). (0, 0), (0, 2), (1, 1), (1, 2), (2, 0), (2, 1) and (2, 2) are the other points from the field, and none of them satisfy the equation.

By submitting this form, you accept the Mollom privacy policy.