we shall see in the exercises examples of functions

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Unformatted text preview: een (−4, −3) and (−2, 4.5), we are walking ‘uphill’; then between (−2, 4.5) and (3, −8), we are walking ‘downhill’; and between (3, −8) and (4, −6), we are walking ‘uphill’ once more. From (4, −6) to (5, −6), we ‘level off’, and then resume walking ‘uphill’ from (5, −6) to (6, 5.5). In other words, for the x values between −4 and −2 (inclusive), the y -coordinates on the graph are getting larger, or increasing, as we move from left to right. Since y = f (x), the y values on the graph are the function values, and we say that the function f is increasing on the interval [−4, −2]. Analogously, we say that f is decreasing on the interval [−2, 3] increasing once more on the interval [3, 4], constant on [4, 5], and finally increasing once again on [5, 6]. It is extremely important to notice that the behavior (increasing, decreasing or constant) occurs on an interval on the x-axis. When we say that the function f is increasing on [−4, −2]...
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