How Can You Tell if a Function is Linear or Nonlinear From a Graph?

How Can You Tell if a Function is Linear or Nonlinear From a Graph?

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communicate mathematical ideas, reasoning, and their implications using multiple representations, including symbols, diagrams, graphs, and language as appropriate

To see if a table of values represents a linear function, check to see if there's a constant rate of change. If there is, you're looking at a linear function! This tutorial shows you how to tell if a table of values represents a linear function.