Khan Academy: Evaluating Expressions With Two Variables

Graph linear equations using a table of values. Learners solve equations in two variables using standard form of an equation. They identify the relationship between x and y values.

Introduce learners to independent and dependent variables with an informative video.The two variables are defined via inputs and outputs. It makes clear that the independent variable is the one that the person has control over,...

Sal adds a few more steps to these problems as he solves algebraic equations with two steps, though he states that "there's more than one way to do it." Those who become confused by increasingly complicated algebra problems on a test...

Evaluating expressions require two things- parentheses and PEMDAS. The video starts with an emphasis on using parentheses to plug in your variables. Once you have everything plugged in, PEMDAS will get your mathematicians to the correct...

Practice evaluating expressions in two variables by plugging in values for the variables. These problems include some fractions and decimals. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch...

Practice evaluating expressions in two variables by plugging in values for the variables. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Sometimes you'll need to solve an equation with multiple variables on each side. This step-by-step tutorial will show you how to set your equation to 0, factor out the GCF, simplify, write your answers as a set, then plug and chug to...

In this exercise, students practice writing expressions with variables. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.

Solve multi-step expressions with parentheses. Place parentheses in an expression to make the expression equivalent to a given number. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...

Solving equations in two variables can't be that much harder than solving equations in one variable. Using a balance interactive, scholars solve equations in two variables. They apply inverse operations by adding -x, -y, or -1 as...