By setting one variable constant, find a plane that intersects the graph of z = -49x² + y² + 1 in each of the followings: a) Parabola opening upward: The intersecting plane is The equation of the intersecting curve is b) Parabola opening downward: The intersecting plane is The equation of the intersecting curve is c) Pair of intersecting straight lines: The intersecting plane is Equations of intersecting lines y =

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