If the line `ax+by+c=0` is a tangent to the curve `xy=4` then

If the line ax+by+c=0 is a tangent to the curve xy+4=0 then

If the line ax+by+c=0 is a tangent to the curve xy=9, then

If the line ax+by+c=0 is a tangent to the curve xy=9, then

If the line ax + by + c = 0 is a tangent to the curve xy + 4 = 0 then

If the line ax+by+c=0,abne0 , is a tangent to the curve xy=1-2x , then

If the line ax+by +c =0 is a normal to the curve xy=1 at the point (1, 1), then -

If the line ax+by+c=0 is a normal to the curve xy=1, then a>0,b>0a>0,b<0a(:0,b:)0(d)a<0,b<0 none of these

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