If x^2+x y+y^2=7/4, then (dy)/(dx) at x=...

If `x^2+x y+y^2=7/4,` then `(dy)/(dx)` at `x=1` and `y=1/2` is:

A

`3/4`

B

`(-5)/4`

C

`21/8`

D

`(-21)/8`

Verified by Experts

The correct Answer is:

B

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