For what value of 'k', the pair of equations 6x + 8y + 4 = 0 and 3x + 4y + k/3 = 0 represents coincident lines.

For what value of 'k', the pair of equation 3x+4y+2=0 and 9x+12y+k=0 represent coincident lines.

For what value of P for the pair of equations 5x+6y+8 = 0, and 10x+12y+ P = 0 are coincident lines

For what value of "R", for the pair of equations 7x+3y+4= 0 and 28x+12y+R = 0 to be coincident

Find the value of 'k' for which the pair of equations 2x-ky+3=0, 4x+6y-5=0 represent parallel lines.

Find the value of k for which the pair of equations 2x+ky+3=0,4x+6y-5=0 represent parallel lines.

Prove that the equations 6x^(2) + xy -12y^(2)–14x + 47y -40 = 0 and 14x+ xy- 4y^(2)-30x +15y= 0 represents two pairs of concurrent lines and that lines of first pair are equally inclined to those of second pair.

The values of k for which the pair of linear equations 3x-2y=7 and 6x+ky+11=0 has a unique solution is ………..