find the maximum and minimum values of ax+by , when xy = c^2

Question

find the maximum , minimum values of ax+by , when xy = c^2

Answer 1

What is the minimum value of ax + by where xy = c2?

Q1. (b) If 2p is the perpendicular distance from the origin to the line x/a + y/b = 1, then a2 , 8p2 ,b2 are in :

(a) AP                 (b) GP                   (c) HP                   (d) none

Q1.  (a) Prove that the line which makes an angle tan -15 with the axis of x and which cuts the y axis in the point (0,-5), passes through the point (1,0).