Answer:
I agree, Ali is correct
Explanation:
We need to understand what parallel lines are to answer this question.
Pallel lines are 2d lines on a plane that never touch or meet. They simply run to infinity alongside each other, never meeting in the middle. Consequently, they also have the same slope, but that isn't important right now.
If 2 lines share a point, that means that they are touching. And if 2 lines are touching, they cannot be parallel, as it literally goes against the definition of what parallel lines are.
Therfore, when Ali says that if lines share a common point, they cannot be parallel, he is correct.