Arturo O. answered 05/29/20
Experienced Physics Teacher for Physics Tutoring
x - 6y = 4
3x - 18y = 4
If one equation is a multiple of the other, then you have the same line (infinitely many solutions). Note that if you change the 4 on the right hand side of the second equation to 12, the second equation becomes 3 times the first equation. This new system will have infinitely many solutions.