The point where the x and y axes intersect is called the origin. The origin is located at zero on the x axis and zero on the y axis. We can locate any point on the coordinate plane using an ordered pair of numbers like the example shown here, the ordered pair 4 and 2 (point P).
Seth will have more cards in 20 weeks. The reason for this is because Seth gains 4 more cards a week while Matt only gains 2 More cards a week. So in 20 weeks Seth will have 80 Baseball cards while Matt has 40 Cards.