Question: The equations define u as a function of y if x and z are eliminated. Find du/dy when x = 1, y = 1, z

The equations

x + 2y + 3z + 4u = -3 x + y+z+u =10 x + y + z + u =0

define u as a function of y if x and z are eliminated. Find du/dy when x = 1, y = –1, z = 2, u = –2.

x + 2y + 3z + 4u = -3 x + y+z+u =10 x + y + z + u =0

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