Understanding Main Ideas Answer the following questions in the spaces provided.
1. How are line graphs used to show how two variables are related?
2. What does a line of best fit emphasize?
3. What does a slope tell you about changes in x and y?
4. Why are line graphs powerful tools in science?
Building Vocabulary
Match each term with its definition by writing the letter of the correct definition on
the line beside the term in the left column.
5. coordinate
6. graph
7. origin
8. slope
9. nonlinear graph
10. vertical axis
11. line of best fit
12. data point
13. horizontal axis
a. the point on the graph where the axes cross
b. the graph line that runs up and down
c. a line graph in which the data points do not fall
along a straight line
d. a point on a graph that displays a piece of data
e. a picture of information from a data table
f. the steepness of a graph line
g. a pair of numbers uşed to determine the position
of a point on a graph
h. the graph line that runs left to right
i. a smooth line that reflects a general pattern on a
graph