The system x - 6y = 4, 3x - 18y = 4 has no solution

Question

Change one constant or coefficient to make a new system with an infinite number of solutions.

Answer 1

Your system has no solution because you have two parallel lines
To have an infinite number of solutions, the two equations must be one and the same

notice the left side of your second equation is 3 times the left side of your first equation,
so what do you think should happen to the right side ??