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Question

If x+y=10, find dydx at y=4.

A
4
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B
3
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C
4
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D
3
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Solution

The correct option is C 4
Given equation is x+y=10
12xdxdy+12y=0
dxdy=xy=10yy
dxdy=y10y
(dxdy)y=4=2102=82=4

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