Family Support Materials. Unit: Alg1.2 Linear Equations, Inequalities, and Systems (Algebra 1). Alg1.2 Linear Equations, Inequalities, and Systems In this unit, students expand and deepen their prior understanding of expressions, equations, and inequalities. Students reason about equations, inequalities, and systems of equations and inequalities as ways to represent constraints, and they reason about the process of solving equations and inequalities in terms of finding values that satisfy those constraints. The process of finding solutions may involve rewriting and manipulating equations. Students learn to explain and validate the steps to do so. Throughout the unit, students practice re