for what values of a and b, the equations `5x+8y=7` and `(a+b)x + (a-b)y = (2a+b+1)` have infinite number of solutions

Find the values of a and b for which the equations 5x+8y=7 and (a+b)x+(a-b)y=(2a+b+1) will have infinitely many sets of solution.

Values of a and b so that system of equations 2x + 3y = 7 and 2 ax + (a +b) y = 28 has infinitely many solutons are

Find the values of a and b for which the simultaneous equations x+2y=1 and (a-b)x+(a+b)y=a+b-2 have infinitely many solutions.

For what values of a and b do the equations 2x -y = 4b and (ax)/(3) + by = -4b have more than one solution ?

For what values of a and b do the equations 2x-y=4b and (ax)/(3)+by=-4b have more than one solution?

For what value of k, the equations 3x - y = 8 and 9x - ky = 24 will have infinitely many solutions ? (a)6 (b)5 (c)3 (d)1

Find the values of a and b for which the simultaneous linear equations x+2y=1 and (a-b)x+(a+b)y=a+b-2 have infinitely many solutions.