Chapter 2 Linear Equations and Functions - Extension - Use Discrete and Continuous Functions - Practice - Page 81: 1

See the graph

We are given: $y=2x+3$ Domain: $\{-2,-1,0,1,2\}$ Let's make a list of values: $x=-2 \rightarrow y=-1$ $x=-1 \rightarrow y=1$ $x=0 \rightarrow y=3$ $x=1 \rightarrow y=5$ $x=2 \rightarrow y=7$ The graph consists of separate points, so the function is discrete. The range is $\{-1,1,3,5,7\}$.