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> Find the equation of the plane that is tangent to the plane x = y² + z² - 2 on the point P(-1,1,0).
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I got the equation x = 2y - 3 out of $F\_{x}\Delta x + F\_{y}\Delta y + F\_{z}\Delta z = 0 $.

However this is a line, not a plane.

Are my calculations just plain wrong? Or if I did the math right, then what does this mean? Why do I get a line instead of a plane?