Common Core · Mathematics
A-REI.9
High school · High School: Algebra — Reasoning with Equations & Inequalities
(+) Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension 3 × 3 or greater).
- Official code
- CCSS.MATH.CONTENT.HSA-REI.9
- Short code
- A-REI.9
- Subject
- Mathematics
- Grade
- High school
- Domain
- High School: Algebra — Reasoning with Equations & Inequalities
More High school High School: Algebra — Reasoning with Equations & Inequalities standards
A-REI.1
Explain each step in solving a simple equation as following from the equality of...
A-REI.10
10. Understand that the graph of an equation in two variables is the set of all its...
A-REI.11
11. Explain why the x-coordinates of the points where the graphs of the equations y =...
A-REI.12
12. Graph the solutions to a linear inequality in two variables as a half-plane...
A-REI.2
Solve simple rational and radical equations in one variable, and give examples showing...
A-REI.3
Solve linear equations and inequalities in one variable, including equations with...
A-REI.4
Solve quadratic equations in one variable.
A-REI.4a
Use the method of completing the square to transform any quadratic equation in x into...
A-REI.4b
Solve quadratic equations by inspection (e.g., for x² = 49), taking square roots,...
A-REI.5
Prove that, given a system of two equations in two variables, replacing one equation...
A-REI.6
Solve systems of linear equations exactly and approximately (e.g., with graphs),...
A-REI.7
Solve a simple system consisting of a linear equation and a quadratic equation in two...
A-REI.8
(+) Represent a system of linear equations as a single matrix equation in a vector variable.
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