` 5x - 7 y - 5 =0 , 2x + ky - 1 =0 `

5x - y - 7 = 0 , x - y + 1 = 0

Find the value of k if x + y - 5 = 0 2x + ky - 8 = 0 are conjugate with respect to the circle x^(2) + y^(2) - 2x - 2y -1 = 0

If the lines 2x + y - 3 = 0 , 5x + ky - 3 = 0 " and " 3x - y - 2 = 0 are concurrent , find the value of k.

If the lines 2x + y - 3 = 0 , 5x + ky - 3 = 0 " and " 3x - y - 2 = 0 are concurrent , find the value of k.

If the lines 2x + y - 3 = 0 , 5x + ky - 3 = 0 " and " 3x - y - 2 = 0 are concurrent , find the value of k.

Find the value of k for which the lines 5x + 4y - 6 = 0 and 2x + ky + 9 = 0 are (ii) perpendicular.

Find the value of k for which the lines 5x + 4y - 6 = 0 and 2x + ky + 9 = 0 are (i) parailel,

If the lines 5x - ky + 3 = 0 and 4x - 3y - 4 = 0 are parallel then k = ........... .

Find k if lines 5x - ky- 7=0 and 2x + 3y + 5 =0 are mutually perpendicular.