Explanation:
the solution of a system of 2 equations (lines or other forms of functions) is the set of all intersection points.
that is where the equations are equal, share the same "behavior".
for 2 lines it is only possible to have
- no intersection point (no solution) - when they are parallel.
- 1 intersection point (1 solution) - normal case.
- infinitely many intersection points or solutions - when they are identical.
in our case here we see that most points are different.
so, the lines are not identical.
and there is one point they have in common : (0, 2).
that is the solution, the one intersection point.
since they have a point in common, they cannot be parallel.