Interpreting Line Graphs Understanding the language of line graphs.

Line Graphs Express Slope Line graphs provide an excellent way to map independent and dependent variables that are quantitative. When both variables are quantitative, the line segment that connects two points on the graph expresses a slope. The slope of lines on a graph can be interpreted visually when looked at in relation to the slope of other lines.

Let’s Review Slope The slope of a line measures the steepness of the line. Most of you are probably familiar with associating slope with "rise over run". Rise means how many units you move up or down from point to point. On the graph that would be a change in the y values. Run means how far left or right you move from point to point. On the graph, that would mean a change of x values.

What do these lines mean at a glance?

What would it look like? Draw a quick graph displaying distance y (mi) as a function of time x (hrs). Don’t worry about making it perfect according to the rules this time. Mrs. Goble’s dog leaves her house to chase a squirrel. The dog gets tired and decides to take a nap under a tree in the woods. The dog wakes up and goes to the neighbors house to get in the trash. After getting ran-off the dog goes back home to get in his own trash.

Understanding Graphing Verbs When we interpret graphs there are verbs that are commonly used to describe rise over run. Understanding them helps us interpret graphs. Use a dictionary to find the meaning of the following verbs : plummet increase peak soar rocket fluctuate drop level out decrease decline rise fall

Write the answer to these questions while discussing with an elbow partner. 1. Which 5 verbs mean go up? 2. Of these, which 3 mean go up suddenly/a lot? 3. Which 5 verbs mean go down? 4.Which verb means reach its highest level? 5. Which verb means stay the same? 6. Which verb means go up and down? 7. Which verbs are associated with rise and which with run?

Now decide which parts of the graph below, showing the book sales of a book between 1990 and 2000, can be described using the verbs you defined.

Interpretation can also be made in more detail by modifying a verb with an adverb. Using the same graph as before on the sales of a book from , make sentences describing the changes represented from month to month using verbs and adverbs – – – – 2000 Adverbs: slightly slowly sharply rapidly steadily gradually moderately dramatically

Create sentences using verbs and adverbs – – – – 2000 Adverbs: slightly slowly sharply rapidly steadily gradually moderately dramatically Knowing graphing vocabulary helps you understand what the graph is trying tell you in when it’s picture form.

Create Your Own Graph Using the data provided create a line graph. Be sure that you have followed all the line graphing rules. When your line graph is completed, write a paragraph interpreting what the graph is displaying with words. Use both verbs and adverbs. Be ready to share out with the class.