If `4x+y=34,x+4y=16` then find the value of x+y.

If 4x+5y=10,5x+4y=17 then find the value of x+y and x-y .

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

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 x/y=4/5 then find the value of the ratio (3x^2+y^2)/(3x^2-y^2) .

If x+2y=3 and 2x +3y=4 , then the values of x and y are

If the line 3x-4y=k touches the hyperbola x^2/5-(4y^2)/5=1 , then find the value of k.

if x + 2y=3 and 2x+3y=4, then the values of x and y are