It's 4 on the y axis! There is no line intersecting with points on the x axis.
This type of slope is often confused with vertical lines! Vertical lines are <em>always</em> undefined. Horizontal lines are simply 0. You cannot use RISE/RUN, because you can only go one way on the line, right/left.
1 people eat 3/8 pound of potato salad lets reoresent it: x=3/8 Lets say n is the value of how many people ate with 7 people 7x=n now substitute 7x=n 7(3/8)=n 21/8=n n=2 5/8