`x+y=9`, `x-y=5` find the value of x.

If (x+y, x-y) = (3, 1), find the values of x and y.

If 7x - 15y = 4x + y , find the value of x: y . Hence, use componendo and dividendo to find the values of : (i) (9x + 5y)/(9x - 5y) (iI) (3x^(2) + 2y^(2))/(3x^(2) - 2y^(2))

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

If x-y=7\ a n d\ x y=9, find the value of x^2+y^2

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

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

If 2^(x) = 4 xx 2^(y) and 9 xx 3^(x) = 3^(-y) , find the values of x and y.

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

If 3x-7y=10\ and x y=-1, find the value of 9x^2+49 y^2

If 3x + 4y= 16 and xy= 4 , find the value of 9x^(2) + 16y^(2)