Question

Please assist!
Line A is represented by the equation given below:

x + y = 4

What is most likely the equation for line B, so that the set of equations has infinitely many solutions?

4x + 4y = 4
4x + y = 4
2x + 2y = 8
x + y = 8

Answer 1

Take the third equation and divide it by 2.  If the equations are the same, they have infinitely many solutions because every point on one eq. is the same on the other. You can say they overlap.