Let f(x y) = x2 + y4. Find the slope of the line tangent to this surface at the point (1, - 1) and lying in the a. plane x = 1 b. plane y = - 1. a. The slope of the line tangent to f(x,y) at (1,- 1) and lying in the plane x = 1 is (Simplify your answer.) b. The slope of the line tangent to f(x,y) at (1,- 1) and lying in the plane y = - 1 is (Simplify your answer.)

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A: 5.