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By finding something who's behavior is represented by a linear function and graphing it.
y - |x| is an expression, not a function.
Relationship can also be represented by a set of ordered pairs called a function.
A linear or non linear function is a function that either creates a straight line or a crooked line when graphed. These functions are usually represented on a table under the headings x and y.
A polynomial is a function which can take the form: f(x) = sum(a_n * x^n) where n is a nonnegative integer. 0 is the constant function which can be represented in the form above by taking a_n = 0 for all n.