How to Draw a Graph

A graph is a diagram (as a series of one or more points, lines, line segments, curves, or areas) that represents the variation of a variable in comparison with that of one or more other variables. In other words, values displayed on a Cartesian coordinate system in various ways depending on what you are trying to demonstrate or determine.^[1] Discrete data, such as the average price of cars from year to year, would be a represented as single points on the graph. The calculation is made only once for each year thus the data is discrete. The x axis would denote each year and the y axis would represent the average cost of cars for each year. A line graph would be useful for representing continuous data where every possible value on the x axis has a corresponding value on the y axis. For instance you might want to chart temperatures over time. You can take the temperature at any time so the data is continuous. When trying to calculate slope area, minimum and maximum of a function it is very helpful to draw a graph.