5. Graphing Linear Equations in Slope-Intercept Form
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Think about the word constant in a non-math context.
See solution.
The word constant in a non-math context just means that something continues on the same way as it always has and always will. A constant function is one with the same output value for the entirety of the function's domain. The slope of a constant function, because it always produces the same value, will always be 0.
The above graph is an example of a constant function, y=3. No matter what the input value is, the output is constantly 3.