CCSS.MATH.CONTENT.6.EE.B.5 Understand solving an equation or inequality as a process of answering a question: which values from a specified set, if any, make the equation or inequality true? Use substitution to determine whether a given number in a specified set makes an equation or inequality true.
Mathematics Texas Essential Knowledge and Skills
(9A) write one-variable, one-step equations and inequalities to represent constraints or conditions within problems;
(9B) represent solutions for one-variable, one-step equations and inequalities on number lines;