If `x:y=5:4` and `2:x=3:8` , find the value of `y`.

If x=3 and y=4 , find the value of 3x+2y

If x=3 and y=4 , find the value of 4x-3y

(i) x+2y=-7 and 3x-2y=-1, then find the value of x. (ii) If x+y=8 and 4y-x=2, then find the value of y. (iii) If 3x+5y=9 and 5x+3y=7, then find the value of x+y. (iv) If 3x-y=11 and x-3y=17, then find the value of x-y.

If x = 5/4 and y=(-1)/3 , then find the value of (x + y) xx (x-y) .

If x=5 and y=-2 , then find the value of (i) (8x-2y+5)/(2x+4ty+12) " "(ii) (5x-6y-7)/(3x+6y+12)

If 2x+3y=8 and xy=2, find the value of 4x^(2)+9y^(2)

If 2x-3y=10 and xy=16 , find the value of 8x^(3)-27y^(3) .

If 3x-2y=11 and xy=12, find the value of 27x^(3)-8y^(3)

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

If x=3 and y=4 , find the value of 4x^(2)+5x+3