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2 ( 1.5, 0) (–1.8, 7) (0, 7) (2.5, 7) (0, 3) 0 3. Functions and Their Graphs Input x Output y If a quantity y always depends on another quantity x in such a way that every value of x corresponds to one and only one value of y, then we say that “y is a function of x,” written y = f (x); x is said to be the independent variable, y is the dependent variable. (Example: “Distance traveled per hour (y) is a function of velocity … ................
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