i) If `x+y=6` and `y=3` so find `x`

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

If x^(2) + y^(2) =37 and xy = 6 : find x-y

If x^(2) + y^(2) = 37 and xy = 6, find x+y

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

Find dervatives of the following functions: (i) y=2x^(3) , (ii) y=4/x , (iii) y=3e^(x) , (iv) y=6 ln x , (v) y=5 sin x

If x=4 and y=1, find the value of ((x)/(2)-(y)/(3))((x^(2))/(4)+(xy)/(6)+(y^(2))/(9)) .

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

If (3x -4y) : (2x -3y) = (5x -6y) : (4x -5y) , find : x : y .