1.

If `sqrtx+sqrty=2`, then what is `(dy)/(dx)` at y = 1 and x = 1 equal to ?A. 5B. 2C. 4D. `-1`

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`


Discussion

No Comment Found