So, you make the graph, you find the slope (maybe this is on graph paper with a best fit line) and then you use that slope to find k. Simple. Here is a plot of that same data from the google ...

For example, if you have several types of data in each category, you can use a clustered bar to represent it side-by-side in a single category or a stacked bar to represent individual data points ...

A dot plot or dot chart consists of data points plotted on a graph. The Federal Reserve uses dot plots to show its predicted interest rate outlook.

This post recommends using Trellis plots instead of 3D bar charts for three-dimensional (three variable) data. In Winner of the Bad Graph Contest Announced, I promised to present alternatives to ...