Lines have infinite solutions

Given that the system of equations 3x + ky = 1 and 6x + 3y = 2 . For what value of k does this system have infinite solutions ?

The value of C for which the pairs of equation cx-y=2 and 6x-2y=4 will have infinite many solutions.

Lines have only one solution

If the pair of equations 2x+3y+k=0, 6x+9y+3=0 having infinite solutions, the value of 'k' is……..

The system has infinite solution , if

The pair of linear equations 3a+4b=k, 9a+12b=6 have infinitely many solutions when,