3-1 Graphing Relationships
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1 Warm Up State whether each word or phrase represents an amount that is increasing, decreasing, or constant. 1. stays the same constant 2. rises 3. drops increasing decreasing 4. slows down decreasing
2 Match simple graphs with situations. Graph a relationship. Objectives
3 continuous graph discrete graph Vocabulary
4 Graphs can be used to illustrate many different situations. For example, trends shown on a cardiograph can help a doctor see how a patient s heart is functioning. To relate a graph to a given situation, use key words in the description.
5 Example 1: Relating Graphs to Situations Each day several leaves fall from a tree. One day a gust of wind blows off many leaves. Eventually, there are no more leaves on the tree. Choose the graph that best represents the situation. Step 1 Read the graphs from left to right to show time passing.
6 Example 1 Continued Step 2 List key words in order and decide which graph shows them. Key Words Segment Description Graphs Each day several leaves fall Wind blows off many leaves Eventually no more leaves Never horizontal Slanting downward rapidly Slanting downward until reaches zero Graph B Graphs A, B, and C Graphs A, B, and C
7 Never horizontal Slanting downward rapidly Slanting downward until it reaches zero
8 Check It Out! Example 1 The air temperature increased steadily for several hours and then remained constant. At the end of the day, the temperature increased slightly before dropping sharply. Choose the graph that best represents this situation. Step 1 Read the graphs from left to right to show time passing.
9 Check It Out! Example 1 Continued Step 2 List key words in order and decide which graph shows them. Key Words Segment Description Graphs Increased steadily Remained constant Increased slightly before dropping sharply Slanting upward Horizontal Slanting upward and then steeply downward Graph C Graphs A, B, and C Graphs B and C Step 3 Pick the graph that shows all the key phrases in order. The correct graph is graph C.
10 As seen in Example 1, some graphs are connected lines or curves called continuous graphs. Some graphs are only distinct points. They are called discrete graphs The graph on theme park attendance is an example of a discrete graph. It consists of distinct points because each year is distinct and people are counted in whole numbers only. The values between whole numbers are not included, since they have no meaning for the situation.
11 Example 2A: Sketching Graphs for Situations Sketch a graph for the situation. Tell whether the graph is continuous or discrete. A truck driver enters a street, drives at a constant speed, stops at a light, and then continues. As time passes during the trip (moving left to right along the x-axis) the truck's speed (y-axis) does the following: initially increases remains constant decreases to a stop increases remains constant The graph is continuous.
12 Helpful Hint When sketching or interpreting a graph, pay close attention to the labels on each axis.
13 Example 2B: Sketching Graphs for Situations Sketch a graph for the situation. Tell whether the graph is continuous or discrete. A small bookstore sold between 5 and 8 books each day for 7 days. The number of books sold (y-axis) varies for each day (x-axis). Since the bookstore can only sell whole numbers of books, the graph is 7 distinct points. The graph is discrete.
14 Check It Out! Example 2a Sketch a graph for the situation. Tell whether the graph is continuous or discrete. Jamie is taking an 8-week keyboarding class. At the end of each week, she takes a test to find the number of words she can type per minute. She improves each week. Each week (x-axis) her typing speed is measured. She gets a separate score (y-axis) for each test. Since each test score is a whole number, the graph consists of 8 distinct points. The graph is discrete.
15 Sketch a graph for the situation. Tell whether the graph is continuous or discrete. Check It Out! Example 2b Henry begins to drain a water tank by opening a valve. Then he opens another valve. Then he closes the first valve. He leaves the second valve open until the tank is empty. As time passes while draining the tank (moving left to right along the x-axis) the water level (y-axis) does the following: initially declines decline more rapidly and then the decline slows down. The graph is continuous.
16 Both graphs show a relationship about a child going down a slide. Graph A represents the child s distance from the ground related to time. Graph B represents the child s Speed related to time.
17 Example 3: Writing Situations for Graphs Write a possible situation for the given graph. Possible Situation: A car approaching traffic slows down, drives at a constant speed, and then slows down until coming to a complete stop. Step 1 Identify labels. x-axis: time y-axis: speed Step 2 Analyze sections. over time, the speed: initially decreases, remains constant, and then decreases to zero.
18 Check It Out! Example 3 Write a possible situation for the given graph Step 1 Identify labels. x-axis: students y-axis: pizzas Step 2 Analyze sections. As students increase, the pizzas do the following: initially remains constant, and then increases to a new constant. Possible Situation: When the number of students reaches a certain point, the number of pizzas bought increases.
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