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

If 3x - 2y = 12 and 6x + y = 9 , then find the values of x and y

if (x-y)^3=216 and (x-y)^5=32 , then find x^3-y^3 . The following steps are involved in solving the above problem. Arrange them in sequential order. (A) Therefore, x-y=6 and x+y=2 . (B) Solving x-y=6 and x+y=2rArrx=4, y=-2 . (C) x^3-y^3=64-(-2)^3=64+8=72 (D) (x-y)^3=216rArr(x-y)^3=6^3rArr x-y=6 and (x+y)^5=32rArr (x+y)^5=2^5rArr x+y=2 .

If x : y = 3 : 4 and y : z = 6 : 11," then find " x : y : z .

If 2x +3y = 30 and (x+y)/y = 11/8 , then find the value of 5y + 6x

If 6^(x-y)=36 and 3^(x+y)=729 , then find x^(2)-y^(2) .

If (x+y):(x-y)=7:3, then find the ratio (x^(3)+y^(3)):(x^(3)-y^(3))

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 y= = log_(x-3)(x^(2)-6x+9) ,then find y.