Functions as Graphs in the Coordinate System

You have earned that a function is a value whose size depends on the size of another value. If you think about line graphs and histograms, they are functions. The one value is the size of the bar or the height of the line, and it depends on the other value, which is the value of the item in the interval. Specifically, if you pick any value on the horizontal line, any value that falls within the intervals you are working with, you can then measure upwards until you hit the top of the bar or run into the line. So the input to the function is the category value and the output from the function is the height.