If `x = 1, y = 3` and `x + y = K`. Find the value of K.

If K is constant such that xy + k = e ^(((x-1)^2)/(2)) satisfies the differential equation x . ( dy )/( dx) = (( x^2 - x-1) y+ (x-1) and y (1) =0 then find the value of K .

If the middle point of the line segment joining (3, 4) and (k, 7) is (x, y) and 2x+2y+1=0 , find the value of k .

If 1/x+1/y=k and 1/x-1/y=k , then the value of y is:

For what value of k system of equations 3x + 4y = 19, y - x = 3 and 2x + 3y = k has a solution ?

If x:y=2:3 , y:z=3:4 , z:k=1:2 , find the value of x:y:z:k

If the lines y=x+1 , y=2x and y=kx+3 are concurrent find the value of 'k' .

If sin^(-1)x+sin^(-1)y=pi and x=ky then find the value of (39)^(2k)+5^(k)

The value of k, for which the pair of linear equations k x + y = k^(2) and x + k y = 1 has infinitely many solution, is :

If x=3k+2 and y = 2k-1 is a solution of the equation 4x-3y+1=0 , find the value of k.

If x=3 and y=4 is a solution of the equation 5x-3y=k , find the value of k.