**Unit 2 Resources**

Parent Resources for Unit 2

**1) MCC9‐12.A.REI.1**Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.

REI.1 Learnzillion Videos

The properties of operations

The properties of equality

Algebraic properties of equality (flashcards)

A. REI.1 Review Sheet

**2) MCC9**

**‐**

**12.A.REI.3**Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.

REI.3 Learnzillion Videos

Linear equations in one variable - Video

Solving linear inequalities in one variable - Video

Solving literal equations (equations with coefficients represented by letters)

A. REI.3 Review Sheet

**3) MCC9**

**‐**

**12.A.REI.5**Prove that, given a system of two equations in two variables, replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions.

REI.5 Learnzillion Videos

Solving systems of equations - Elimination

Solving systems of equations Handout (Steps)

**4) MCC9**

**‐**

**12.A.REI.6**Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.

REI.6 Learnzillion Videos

Solving systems of equations - Graphing

Solving systems of equations - Substitution

Solving system of equations - Video in English & Spanish

Graphing systems of equations - Video in English & Spanish

A. REI.5 & A. REI.6 Review Sheet

**5) MCC9**

**‐**

**12.A.REI.12**Graph the solutions to a linear inequality in two variables as a half‐plane (excluding the boundary in the case of a strict inequality), and graph the solution set to a system of linear inequalities in two variables as the intersection of the corresponding half‐planes.

Solving systems of linear inequalities

Systems of linear inequalities - Video

Graphing systems of inequalities

A. REI.12 Review Sheet