In CCSS Mathematics, which domain focuses on solving linear equations and understanding functions through variables and expressions?

• A. Geometry
• B. Expressions and Equations
• C. Statistics and Probability
• D. Functions

Answer: (B)

This item targets how algebra is organized in CCSS, specifically working with symbols and solving for unknowns. The domain that covers writing, interpreting, and manipulating algebraic expressions and solving linear equations in one variable fits this best, since it focuses on using variables and expressions to represent and find quantities. Functions, on the other hand, emphasizes understanding the idea of a rule that assigns each input to a unique output, including function notation and graphing, rather than just solving equations. Geometry and Statistics and Probability focus on shapes/properties and data analysis or chance, which are not centered on solving linear equations. So the best-fit domain for solving linear equations and understanding relationships through variables and expressions is Expressions and Equations.