If `x+y=6` if `x=3` then find y?

If 2x+3y=13 and x y=6 , find the value of 8x^3+27\ y^3

If 2x+3y=13 and x y=6 , find the value of 8x^3+27 y^3

If 3x+2y=12 and x y=6 , find the value of 9x^2+4y^2

(6) If y=x^2e^-x find y_8

If 2x+3y=13 and x y=6, find the value of 8x^3+27 y^3

If x: y = 3:5, find 4x + 5y: 6x + 7y.

If 3x+2y=12 and x y=6, find the value of 9x^2+4y^2

If 9x^2+25 y^2=181 and x y=-6, find the value of 3x+5y

If [(2x+y,3y),(0, 4)]=[(6, 0),( 6, 4)] , then find x .

Givne (x)/(y)=(5)/(6) now x is reduced by 62 and the ratio of x and y becomes (2)/(3) then find x and y respectively :-