If `x + y = 5 and x = 3`, then find the value of y.

If 3x+5y =9 and 5x+3y=7, then find the value of x+y.

(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 3x + 5y = 21 and 2x +3y = 13 , then find the values of x and y .

If 5x-2y = 17 and 3x +y =8 , then find the values of x and y .

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

IF 3x +5Y = 9 and 5x + 3y =7 then find the value of x+y

If 4x + 3y = 25 and 5x + 2y = 26 , then find the values of x and y

(a) If x : y = 3 : 4 , then find the value of the ratio (2x + y) : ( 9x - 2y) . (b) If x : y = 5 : 4 , then find the value of the ratio (x^(2) + xy) : (x^(2) - xy) .