District 11 Division of Operations & Instruction
Mathematics


Integrated Algebra & Geometry, Quarter 2: Systems of Equations 
Mitchell High School (@ 20 - 23 days

Overview 
During the first quarter you learned about linear data. Now that you have an understanding of data that is linear, it is time to apply that understanding to other real-world situations and look at others kinds of models. During this quarter, you will learn to apply what you have learned to solve practical problems like this one: The school wants to order pizzas for the freshman class. They ask for your advice. You find that Little Geezers only charges $5 per pizza, but has a $30 service charge. Momma Jane’s charges $10, but offers a $20 discount. How would you advise them?

For Teachers
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Standards

Enduring Understandings - important ideas that students should carry with them years beyond the instruction received this year.

  • Algebra is a way of thinking. Functions model the real world. Models can assist in decision-making.

Essential Questions - most important “big picture” questions students should be able to answer after completing learning activities.

  • How are functions used to model data? In what ways can we use mathematical thinking to model real world situations?

  • How do you know that your model is a good one?

  • How are linear and non-linear functions similar and different?

  • What does a “solution” to a system of equations mean?

  • How can you use a system of equations as a model and its solution to make a decision or offer advice?

  • What does the solution look like?  How can we find an input so that our two functions give the same output?

  • In what ways can you represent a function? Why would you represent a function in multiple ways?

Standards: Highest Frequency High Frequency Other Standards and E-Skills

Standard2: Algebra: Students use algebraic methods to explore, model, and describe patterns and functions involving numbers, shapes, data, and graphs in problem-solving situations and communicate the reasoning used in solving these problems.
Benchmark 2.1 Model real world phenomena (for example: distance-verses-time relationships, compound interest, amortization tables, mortality rates-using functions, equations, inequalities, and matrices)
Benchmark 2.2 Represent functional relationships using written explanations, tables, equations and graphs and describe the connections among these representations.
Benchmark 2.3 Solve problems involving functional relationships using graphing calculators and/or computers, as well as, appropriate paper-and-pencil techniques.
2.1a Model real world phenomena involving linear and non linear relationships using multiple representations of rules that can take the form of recursive processes, functions, equations or inequalities.
2.2b Convert from one functional representation to another.
2.3b Solve simple systems of equations using algebraic, graphical, and numeric methods.
Take raw data and write a rule that can be used to model the data and make prediction from it.
Fluency between numeric, symbolic, and graphic representations Solve systems of equations in two variable using 3 methods: Algebraic, Graphic, Numeric

Lessons

Lesson 1: Solving Systems of Equations Using Tables and Graphs (opposite signed slopes)

Duration: @ 45 minutes or 1 class period

Essential Question:  What will the point where two lines intersect (or solution) mean in the context of a problem?

Activity: You will build a table of data based on linear information for one set of conditions and graph the data on a graph. You will repeat this process with another set of linear information. The graphs will be put on the same graph. You will locate and interpret the meaning of the point of intersection (or solution).

Resources - Lesson 1 and Worksheet 1

Differentiation
Extension:
Support:


Lesson 2: Solving Systems of Equations Using Tables and Graphs (same signed slopes)

Duration: @ 45 minutes or 1 class period

  • Standard information #:  Standard #
  • District Indicator: Write district indicator here
  • Enduring Understanding: Write enduring understanding here.
  • Essential Questions: Write essential question here.
  • Assessment: Write assessment here.

Essential Question: How will you use the point where two lines intersect (or solution) to make a decision or offer advice in the context of a problem?

Activity: You will build a table of data based on linear information for one set of conditions and graph the data on a graph. You will repeat this process with another set of linear information. The graphs will be put on the same graph. You will locate and interpret the meaning of the point of intersection (or solution).  In addition to that you will begin to interpret the graphs before and after the points of intersection and use that interpretation to make a decision or offer advice.

Resources: Lesson 2 and Worksheet 2
Differentiation
Extension:
Support:


Lesson 3: X- and Y-Intercepts as Special Cases of Systems of Equations

Duration: @ 1 class period

Essential Question:  What can the points where a graph intersects the x- and y-axis (the intercepts) mean in the context of a situation?

Activity: You will build a table of data based on linear information for one set of conditions and graph the data on a graph. You will repeat this process with another set of linear information. The graphs will be put on the same graph. You will locate and interpret the meaning of the point of intersection (or solution)

Resources - Lesson 3 with the Part II and Part III attachments, and Worksheet 4
Differentiation
Extension:
Support: