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# How do I read a line graph?

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Use the titles of the vertical and horizontal axes of a line graph to understand the plotted points on it. The horizontal axis reflects an independent variable, such as time elapsed or occurrences of an event, while the vertical axis reflects the effect of that variable on a different factor.

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One example of a line graph could track the temperature of a particular place over time. The horizontal axis could reflect the time of day, with marks set up every 15 minutes, every hour, every six hours or the time periods at which measurement of the temperature is desired.

Measuring the temperature at the assigned time provides the information for the points on the graph. The marks going up the vertical axis could begin at zero and go several degrees above the highest temperature that the area generally receives at that time of year; if the temperature goes below zero, then the vertical axis range should include negative numbers. At each assigned time, measuring the temperature provides the coordinates for the point. At 8:00 p.m., if the temperature is 55 degrees Fahrenheit, then the right point to plot would sit above 8:00 p.m. on the horizontal axis and at 55 degrees Fahrenheit on the vertical axis. At the next point in time on the horizontal axis, measuring the temperature again provides the next point. Connecting the points with a line completes the line graph.

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What was the original color of the White House?

## Related Questions

• A:

According to the Cambridge Dictionary, a broken line graph is "a graph that shows information as dots that are connected by straight lines." These graphs do not necessarily form an overall straight line. Each data point is often a vertex where the line makes a change in direction.

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To create a line graph in Microsoft Excel 2013, use the mouse to highlight the data you want to include in the graph, and select the desired type of line graph from the Insert tab. Be sure to highlight the headings of rows and columns of the data table.

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Graphing x = 3 is a matter of drawing a vertical line on the Cartesian plane. For any equation x = n, where n is any real number, the resulting graph is a vertical line crossing the x-axis at the value of n. To graph the given equation, draw the Cartesian plane, plot the coordinates of the graph, and draw a line through it.