what is the slope of the function

Question

what is the slope of the function f(x)= x²+xy+y²=5 at (1,1)?

Select one:

A. no slope

B. -3/2

C. 3/2

Answer 1

plus x=1, y=1 into the function, you get 1+1+1 =3

the point (1,1) is not on the curve

best answer is no slope