We want to see what lines do we have when in a system of linear equations we have infinite solutions.
We will see that the correct option is the first one, the two lines are the same one.
A system of linear equations is something like:
The solutions of that system are given by the intersections between these two lines, then there are 3 options.
No solutions- This happens if the lines are parallel, so they never intersect.
One solution- This happens if the lines intersect one time
Infinite solution- This happens if the lines intersect at infinite points, and this only can happen if both equations describe the exact same line.
So the correct option is the first one, if we have infinite solutions, then the two lines are in fact the same line.
If you want to learn more, you can read:
https://brainly.com/question/21981879
