If 2/x+3/y=9/xy and 4/x+9/y=21/xy. Then the value of x and y are?

A 1 and 21

B 3

C 2 and 3

D 2 and 1

Correct Answer: Option B

2/x+3/y=9/xy or,2y+3x=9......(i) 4/x+9/y=21/xy 4y+9x=21.....(ii) i-ii, -3x=-3 or,x=1 এখন , 2y+3x=9 or,2y+3=9 so, y =3