### Home > CCA > Chapter 2 > Lesson 2.1.3 > Problem2-31

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). Homework Help ✎

 Figure # $x$ 0 1 2 3 4 # of tiles $y$ 4 8 12 16 20

There can only be one $y$-value for each $x$-value in a function.

Plot the points on a graph and draw a slope triangle or use another method to find the slope.
The $y$-intercept is given in the chart when $x=0$.

$f(x)=4x+4$

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