Download 9th Grade Unit 2

9th Grade Unit 2
9th Grade Math Class: Lesson Number 2 Day 2
Key Standards addressed in this Lesson: MCC9-12.A.REI.5&6
Time allotted for this Lesson: 1 day
Materials Needed:
Graph paper
Colored pencils
Key Concepts in Standards: Refer to TE
 solve linear equations in one variable.
 solve linear inequalities in one variable.
 solve a system of two equations in two variables by using multiplication and addition.
 solve a system of two equations in two variables graphically
 graph a linear inequality in two variables.
 graph a system of two linear inequalities in two variables.
Essential Question(s): Refer to TE
How do I justify the solution to an equation?
How do I prove that a system of two equations in two variables can be solved by multiplying and
adding to produce a system with the same solutions?
How do I solve a system of linear equations graphically?
How do I graph a linear inequality in two variables?
How do I graph a system of linear inequalities in two variables?
Vocabulary: (Tier) Refer to TE
Tier 1: already knows
Tier 2: needs review
Tier 3: New Vocabulary
Tier 1
Tier 2
Tier 3
Algebra
Variable
Ordered Pair
Elimination
Coefficient
Substitution
Equation
Expression
Inequality
Concepts/Skills to Maintain: Refer to TE
 Interpreting a graph
 Creating a table of values
 Being able to read and write inequality symbols
 Graphing equations and inequalities on the coordinate plane
Opening: (use on the Elmo)
Solving Systems of Equations Algebraically Task from Georgia DOE: Part 1, #1
9th Grade Unit 2
Work Session:
Complete task: Solving Systems of Equations Algebraically (Part 1 and 2)
Additional Resources:
Punchline Algebra Book A: 8.3, 8.4, 8.5
Carnegie Coordinate Algebra 6.2-6.4
Closing:
TOD: Explain how to eliminate “y” in the following system.
Explain how to eliminate “y” in the following system.
7 x  5 y  23
2 x  7 y  15
Corresponding Task(s) (if not in work session – there may be several tasks that fit) –
****All Tasks can be found at www.georgiastandards.org****
Highlight the Mathematical Practices that this lesson incorporates:
Make sense
of problems
and
persevere
in solving
them
Reason
abstractly
and
quantitatively
Construct
viable
arguments
and critique
the
reasoning
of others
Model with
mathematics
Use
appropriate
tools
strategically
Attend to
precision
Look for
and make
sure of
structure
Look for
and
express
regularity in
repeated
reasoning