Graphing Relationships Warm Up State whether each word or phrase represents an amount that is increasing, decreasing, or constant. 1. stays the same constant 2. rises increasing 3. drops decreasing 4. slows down decreasing Holt McDougal Algebra 1 Graphing Relationships Objectives Match simple graphs with situations.
Graph a relationship. Holt McDougal Algebra 1 Graphing Relationships Vocabulary continuous graph discrete graph Holt McDougal Algebra 1 Graphing Relationships Graphs can be used to illustrate many different situations. For example, trends shown on a
cardiograph can help a doctor see how a patients heart is functioning. To relate a graph to a given situation, use key words in the description. Holt McDougal Algebra 1 Graphing Relationships 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. Holt McDougal Algebra 1 Graphing Relationships Example 1 Continued Step 2 List key words in order and decide which graph shows them. Key Words Each day several leaves fall Segment Description Graphs
Never horizontal Graph B Wind blows off many leaves Slanting downward rapidly Graphs A, B, and C Eventually no more leaves
Slanting downward until reaches zero Graphs A, B, and C Holt McDougal Algebra 1 Graphing Relationships Never horizontal Slanting downward rapidly Slanting downward until it reaches zero Holt McDougal Algebra 1
Graphing Relationships 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 . Holt McDougal Algebra 1 Graphing Relationships Check It Out! Example 1 Continued Step 2 List key words in order and decide which
graph shows them. Key Words Increased steadily Remained constant Increased slightly before dropping sharply Segment Description Graphs Slanting upward
Graph C Horizontal Graphs A, B, and C Slanting upward and then steeply downward Graphs B and C Step 3 Pick the graph that shows all the key phrases in order. The correct graph is graph C. Holt McDougal Algebra 1
Graphing Relationships 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.
Holt McDougal Algebra 1 Graphing Relationships 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 Holt McDougal Algebra 1 The graph is continuous. Graphing Relationships Helpful Hint
When sketching or interpreting a graph, pay close attention to the labels on each axis. Holt McDougal Algebra 1 Graphing Relationships 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. Holt McDougal Algebra 1 Graphing Relationships 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. Holt McDougal Algebra 1 Graphing Relationships Check It Out! Example 2b Sketch a graph for the situation. Tell whether the graph is continuous or discrete. 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. Holt McDougal Algebra 1 Graphing Relationships Both graphs show a relationship about a child going down a slide. Graph A represents the childs distance from the ground related to time. Graph B represents the childs Speed related to time. Holt McDougal Algebra 1
Graphing Relationships Example 3: Writing Situations for Graphs Write a possible situation for the given graph. Step 1 Identify labels. axis: time y-axis: speed x- Step 2 Analyze sections. over time, the speed: initially decreases, remains constant, and then decreases to zero. Possible Situation: A car approaching traffic slows down, drives at a
constant speed, and then slows down until coming to a complete stop. Holt McDougal Algebra 1 Graphing Relationships 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. Holt McDougal Algebra 1 Graphing Relationships Lesson Quiz: Part I 1. Write a possible situation for the given graph. Possible Situation: The level of water in a bucket stays constant. A steady rain raises the level. The rain slows down. Someone dumps the bucket. Holt McDougal Algebra 1 Graphing Relationships
Lesson Quiz: Part II 2. A pet store is selling puppies for $50 each. It has 8 puppies to sell. Sketch a graph for this situation. Holt McDougal Algebra 1
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