(a) The plane y+ =9 intersects the cylinder x+y- 25 in an ellipse, Find parametric equations for the tangent line to this ellipse at the point (4, 3, 6). (Enter your answer as a comma- separated list of equations. Let x, y, and z be in terms of t.) (b) Graph the cylinder, the plane, and the tangent line on the same screen.

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