1a. If both axes increase by set intervals of a certain number.
1b. If the line follows a straight path.
1c. If the words follow this basic pattern: For every ____ things, there are ____ units (plus ___ other units).
1d. The equation must include the X-axis multiplied by a number (or on its own), and with a Y-intercept (if it possesses one). No other variables may be included.
2. Making a graph is by far the easiest to see, but the graph takes time to create and the graph even more so. The sentence is probably easiest to get ahold of, but requires interpretation to calculate. The generates a spectrum: The easier it is to get ahold of the data, the harder it is to determine if it's linear or not. From easiest to find or make, to hardest: Words, Equation, Table, Graph.
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