The given point is on the curve. Find the lines that are

a. Tangent

b. Normal to the curve at the given point.

x^{2} +xy – y^{2} = -4 ,(2,4)

**Solution:-**

a. Give the equation of the that is tangent to the curve at the given point.

y =

b. Given the equation of the line that is normal to the curve at the given point.

y =