Determine whether a value is a solution to an equation or inequality by using substitution to conclude whether a given value makes the equation or inequality true.

Example Problems
Does satisfy this inequality:
Does satisfy this inequality:
Does satisfy this inequality:
Khan Academy Resources
Finding mistakes in one-step equationsEvaluating expressions with one variableEvaluating expressions with two variables: fractions & decimalsIntro to equationsEvaluating expressions with variables word problemsOrder of operations reviewEvaluating expressions with two variablesExpression value intuitionOne-step addition & subtraction equationsOne-step multiplication & division equationsOne-step multiplication & division equationsEvaluating expressions with multiple variablesOne-step addition & subtraction equationsEvaluating expressions with one variableModel with one-step equationsTesting solutions to equationsOne-step addition & subtraction equations: fractions & decimalsExpression value intuitionOrder of operations with fractions and exponentsEvaluating expressions with variables word problemsTesting solutions to inequalitiesEvaluating expressions with multiple variables: fractions & decimalsFind the mistake in one-step equationsSolve equations from visual modelsIdentify equations from visual models (tape diagrams)Model with one-step equations and solveInequalities word problemsTranslate one-step equations and solveTesting solutions to inequalities (basic)Order of operationsIdentify equations from visual models (hanger diagrams)One-step multiplication & division equations: fractions & decimalsOne-step addition & subtraction equationsEquation word problem: super yoga (2 of 2)Equation word problem: super yoga (1 of 2)Evaluating an expression with one variableOrder of operations exampleOne-step addition equationOne-step multiplication equationsEvaluating expressions with variables: temperatureEvaluating expressions with variables: exponentsIntro to order of operationsWorked example: Order of operations (PEMDAS)One-step division equationsSame thing to both sides of equationsRepresenting a relationship with an equationDividing both sides of an equationOne-step equations intuitionTesting solutions to equationsEvaluating expressions with variables: cubesOrder of operations introductionOrder of operations example: fractions and exponentsInequalities word problems One-step addition & subtraction equations: fractions & decimalsOne-step multiplication & division equations: fractions & decimalsEvaluating expressions with two variables: fractions & decimalsTesting solutions to inequalitiesFinding mistakes in one-step equationsEvaluating expressions with two variablesModeling with one-step equationsOrder of operations examples: exponentsExpression value intuition
Goblins

1-on-1 AI tutoring aligned to 6.18. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →