Khan Academy: Add & Subtract Polynomials: Two Variables

Can an equation have an infinite number of solutions? Allow your class to discover the relationship between the input and output variables in a two-variable equation. Class members explore the concept through tables and graphs and...

Sal beautifully explains how to subtract two polynomial expressions with multiple variables. He groups like terms and the distributive property to create a single expression.

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,...

Example: Subtract or add polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Example: Subtract (x^2+2xy-y) and (3x+5xy+2y^2).

Practice adding and subtracting polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.

This video demonstrates how to evaluate an expression with two variables using substitution. [1:46]

Example: Subtract -2x^2+4x-1 from 6x^2+3x-9.

Everything you need to teach a lesson on two variable linear equations is right here. Objective, vocabulary, tech tips videos, and multiple downloadable files are all included. Learners will use the TI-Nspire technology to determine the...

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...