" 39."(2)/(x)+(3)/(y)=(9)/(xy);(4)/(x)+(9)/(y)=(21)/(xy);(x!=0,y!=0)

Solve the following system of equations: (2)/(x)+(3)/(y)=(9)/(xy),quad (4)/(x)+(9)/(y)=(21)/(xy), where x!=0,y!=0

If (2)/(x) + (3)/(y) = (9)/( xy ) and (4)/(x) + (9)/(y) = (21)/(xy) where x ne 0 and y ne 0, that what is the value of x + y ?

(xy)/(x-y)=(1)/(2);(xy)/(x+y)=(1)/(5) wherex +y!=0;x-y!=0

Solve the following system of equations: 2/x+3/y=9/(x y),\ \ \ 4/x+9/y=(21)/(x y),\ \ where x!=0,\ y!=0

Add the following (8)/(5)x+(11)/(7)y+(9)/(4)xy,-(3)/(2)x-(5)/(3)y-(9)/(5)xy

Find the following products: (i) (0.9x+0.7y)(0.81x^(2)-0.63xy+0.49y^(2)) (ii) ((2x)/(5)-(3y)/(7))((9y^(2))/(49)+(4x^(2))/(25)+(6xy)/(35))

The value of f(x,y)=((4sqrt(x^(3)y)-4sqrt(x^(3)))/(sqrt(y)-sqrt(x))+(1+sqrt(xy))/(4sqrt(xy)))^(-2)(1+2sqrt((y)/(x))+(y)/(x))^((1)/(2)) when x=9,y=0.04

The value of f(x,y)=((x^(3)y)^((1)/(4))-(y^(3)x)^((1)/(4)))/(sqrt(y)-sqrt(x))+(1+sqrt(xy))/((xy)^((1)/(4)))xx((1+2sqrt((y)/(x))+(y)/(x))^(4) when x=9 and y=0.04

Find the following products: (6x)/(5)(x^(3)+y^(3)) (ii) xy(x^(3)-y^(3))0.1y(0.1x^(5)+0.1y)( iv) (8)/(27)xyz((3)/(2)xyz^(2)-(9)/(4)xy^(2)z^(3))