### Home > MC2 > Chapter 9 > Lesson 9.1.3 > Problem 9-30

Notice that there are two known coordinates:

Now notice that for every difference of -coordinate, the

*-coordinate changes by*

Use this reasoning to fill in the rest of the table.

The difference in the -coordinate from

*to*

*is*

*-coordinate from*

*to*

*is twice as much.*

Find the rule.

To find the rule, look for a pattern that can relate the

*y*-coordinate to the*x*-coordinate.Notice that at

,.

Also remember that the*y*-coordinate increases byfor every units the -coordinate increases.

You can fill in the last*y*-coordinate in the table by substitutinginto the rule. What is the slope?

The slope describes how the values increase.

Complete the table in the eTool below to graph the points.

Click the link at right for the full version of the eTool: *MC2 9-30 HW eTool*