In this lesson we’ll look at piecewise-defined functions and how to write the equation of such a function, given its graph. A piecewise-defined function (also called a piecewise function) is a function that’s made up of different “pieces,” each of which has its own “sub-function” (its own algebraic expression) and its own “sub-domain” (its own part of the domain of the entire piecewise function).

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