Answer:
If it's on a graph and it's a straight line then its linear.
If its not on a graph, it will fall under a few different formulas, but as a general rule if it does not have an exponent on the x or y then it'll be linear.
if it's y = mx + b or f(x) = mx + b
Explanation:
A linear function is in the form y = mx + b or f(x) = mx + b, where m is the slope or rate of change and b is the y-intercept
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