MATH114 Lecture 1: MATH114-LECTURE#1-FUNCTIONS AND THEIR GRAPHS

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A function from a set d(particular domain) to a set r(particular range) is a rule that assigns exactly one y-value to each x-value . A function is denoted by (cid:1877) = (cid:1858)(cid:4666)(cid:1876)(cid:4667) For example: given (cid:1877)= (cid:1876)(cid:2870) and graph 2 below, determine whether (cid:1877)=(cid:1876)(cid:2870) and graph 2 functions. The best method is to graph the two equations (usually you"d have the graphs drawn for you) and check whether each x-value has only one y-value. For one value of x (=3 in this diagram), there is one value of y (=9 for this function). Notice that when x = -3, f(x) also equals to 9. In this situation, 1 value of x still = 1 value of y. Thus one x value equaling one y value (denoted as one-one") and many x values to one y value are defined as functions.

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