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If `sqrtx+sqrty=2`, then what is `(dy)/(dx)` at y = 1 and x = 1 equal to ?A. 5B. 2C. 4D. `-1` |
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Answer» Correct Answer - D Let `sqrtx+sqrty=2` Differentiate w.r.t. x, we get `(1)/(2sqrtx)+(1)/(2sqrty)(dy)/(dx)=0" ...(1)"` Put `y=1, x=1` in equation (1) `(1)/(2)+(1)/(2)(dy)/(dx)=0` `rArr" "(dy)/(dx)=-1` |
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