" 14.If the line "ax+by+c=0" is a normal to the hyperbola "xy=1" ,then "

If the line ax + by + c = 0 is a normal to the curve xy = 1 then

If the line x +y+ k =0 is a normal to the hyperbola x^2/9 - y^2/4 =1 then k =

If the line ax+by+c=0 is a normal to the curve xy=1 then

If the line ax+by+c=0 is a normal to the curve xy=1 , then :

If the line,ax+by+c=0 is a normal to the curve xy=2

If the straight line (a-1)x-by+4=0 is normal to the hyperbola xy=1 then which of the followings does not hold?

If the straight line (a-1)x-by+4=0 is normal to the hyperbola xy=1 then which of the following does not hold ?