Question

Equation of a common tangent to the curves y²= 8x and

xy = – 1 is

• A. 3y = 9x + 2
• B. y = 2x + 1
• C. 2y = x + 8
• D. y = x + 2

Answer 1

Answer: (D)

y = x + 2

Answer 2

Let tangent of y² = 8x is y = mx + $\frac{2}{m}$ since touches

xy = – 1 solve and put D = 0