slope 5/6 through (-18,6)
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piecewise
Graph each "piece" of the function separately, on the given domain.
You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.
the Equation of a Line Given That You Know Two Points it Passes Through.
a function rule