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Lesson 4.1.6 – Teacher Notes Standard: 8.F.A.2 Compare properties of two functions each represented in a different way (algebraically, graphically, numerically in tables, or by verbal descriptions). For example, given a linear function represented by a table of values and a linear function represented by an algebraic expression, determine which function has the greater rate of change. 8.F.A.4 Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x, y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of a linear function in terms of the situation it models, and in terms of its graph or a table of values. Chapter 7 –More practice comparing representations. Lesson Focus: The focus is to have students graph lines without using a table. Slope triangles should be modeled here as well. Truly the purpose is to again reinforce the many ways linear models can be represented no matter what a student is given to begin with. The Learning Log is an essential understanding of the lesson and would make for a great closure activity and a perfect way for teachers to ensure students understand the primary concept. (4-54, 4-55, and 4-56) I can use slope triangles to write a rule given a graph. Calculator: Yes Literacy/Teaching Strategy: Pairs Check (4-54 to 4-56)

Bell work

You have now used your knowledge of growth patterns and Figure 0 to create tile patterns and x → y tables directly from rules.  You have also looked at graphs to determine the equation or rule for the pattern.  Today you will reverse that process and use an equation to create a graph without the intermediate step of creating an x → y table.

4-54. For each of the graphs below: Write a rule. Describe how the pattern changes and how many tiles are in Figure 0.

4-54. Continued For each of the graphs below: Write a rule. Describe how the pattern changes and how many tiles are in Figure 0.

4-55. Now reverse the process 4-55. Now reverse the process. Graph the following rules without first making a table. Parts (a) and (b) can go on the same set of axes, as can parts (c) and (d). Label each line with its equation, y-intercept (where it crosses the y-axis), and a growth triangle. a. y = 4x + 3 b. y = 3x c. y = −3x + 8 d. y = x − 1 graph paper

4-56. Sketch a graph that fits each description below and then label each line with its equation.  You can put all of the graphs on one set of axes if you label the lines clearly.  Use what you know about the growth pattern and Figure 0 to help you. A pattern that has three tiles in Figure 0 and adds four tiles in each new figure.   A pattern that shrinks by three tiles between figures and starts with five tiles in Figure 0.  A pattern that has two tiles in all figures.

Practice a.

b.

c.