### Home > CCA > Chapter 2 > Lesson 2.1.3 > Problem 2-31

2-31.

Does the table below appear to represent a function? If so, write an equation using function notation that represents the table. If not, explain why it cannot represent a function. *2-31 HW eTool* (Desmos).

| 0 | 1 | 2 | 3 | 4 |

| 4 | 8 | 12 | 16 | 20 |

There can only be one -value for each

*-value in a function.*

Plot the points on a graph and draw a slope triangle or use another method to find the slope.

The -intercept is given in the chart when

*.*

Input the points into the table in the eTool below to determine if it represents a function.

Click the link at right for the full version of the eTool: *CCA 2-31 HW eTool*