1.

If x/a+y/b=1 " intersects " 5x^2+5y^2+5bx+5ay-9ab=0 at P and Q, anglePOQ=pi//2 then the relation between a and b is

Answer»

a=B
a=2b or b=2a
a=3b or b=3a
a+b=5

Answer :B


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