1. Find the slope of the tangent in the positive x-direction to the surface z = 5x3...

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1. Find the slope of the tangent in the positive x-direction to the surface z = 5x3 - 4xy at the point (1, 2, -3).
2. Find the slope of the tangent in the positive y-direction to the surface z = x3 - 5xy at (2, 1, - 2).
3. Find the slope of the tangent in the positive y-direction to the surface z = 3x + 2y - 7exy at (3, 0, 2).
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