Question
Question: The locus of a point P(α, β) moving under the condition that the line y = ax + β is a tangent to the...
The locus of a point P(α, β) moving under the condition that the line y = ax + β is a tangent to the hyperbola a2x2−b2y2 = 1 is
A
A parabola
B
A hyperbola
C
An ellipse
D
A circle
Answer
A hyperbola
Explanation
Solution
If y = mx + c is tangent to the hyperbola then
c2 = a2 m2 – b2. Here β2 = a2α2 – b2. Hence locus of P(α, β) is a2x2 – y2 = b2, which is a hyperbola.