Hello everyone. I have a question about system of liner equation.

In wiki,I found an statement which is talking about it is possible for a system of two equations and two unknowns to have no solution (if the two lines are parallel), or for a system of three equations and two unknowns to be solvable (if the three lines intersect at a single point).

I understand that the parallel lines have no common intersect point .So there exist no solution. However, I don’t understand the last one. This question defeats me for a long time. Can someone help me please?