Which of the following is true about the curve x2-xy+y2=3 at the point 2,1 ? A dy/dx exists at 2,1 , but there is no tangent line at that point. B dy/dx exists at 2,1 , and the tangent line at that point is horizontal. C dy/dx exists at 2,1 , and the tangent line at that point is neither hor D dy/dx does not exists at 2,1 , and the tangent line at that point is ve E dy/dx does not exists at 2,1 , and the tangent line at that point is ho
Question
![Which of the following is true about the curve x2-xy+y2=3 at the point 2,1 ? A dy/dx exists at 2,1 , but there is no tangent line at that point. B dy/dx exists at 2,1 , and the tangent line at that point is horizontal. C dy/dx exists at 2,1 , and the tangent line at that point is neither hor D dy/dx does not exists at 2,1 , and the tangent line at that point is ve E dy/dx does not exists at 2,1 , and the tangent line at that point is ho](http://theroyaloaksschool.org/photo/6500990c7ef8e.webp)