The first table is the only table representing a linear function.
Step-by-step explanation:
<em>" You can tell if a table is linear by looking at how X and Y change. If, as X increases by 1, Y increases by a constant rate, then a table is linear. You can find the constant rate by finding the first difference. This table is linear."</em>
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<em>P.S.</em>
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<em>( thanks to G00GLE for the anwers, hat's off to the internet :^) </em>
