If `2x+y=-2,3x-y=7` then find the value of x.

If x-2y =-1 , 2x-y = 7 then find the value of x-y .

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

If 3x+4y=12 and 4x+3y=9 , then find the value of x+y

if a/3 =b/7 =(7a-2b)/x , then find the value of x.

Answer the following:If the tangent at (3,-4) to the circle x^2+y^2=25 touches the circle x^2+y^2+8x-4y+c=0 ,then find the value of c.

If 3x -y = 10 and x-3y= -2 find the value of x-y .

If x/y=13/6 then find the value of (2x^2+5y^2)/(2x^2-5y^2)

If the line x+2b y+7=0 is a diameter of the circle x^2+y^2-6x+2y=0 , then find the value of b

If the line x+2b y+7=0 is a diameter of the circle x^2+y^2-6x+2y=0 , then find the value of b

If x/y=13/6 then find the value of (3x+5y)/(3x-5y)