See how some equations have one solution, some have no solutions, and others have infinite solutions. [5:27]

Learn how to solve a word problem by writing an equation to model the situation. Here, see the linear equation 210(t-5) = 41,790. [5:59]

Models a problem where one must determine whether unknown matrices are zero or identity to make an equation true. [3:58]

Linear equations which can be solved with a single operation are called one-step linear equations. In this video, you will see how to solve one-step linear equations represented in diagrams and in equation form. [2:15]

You will learn how to solve multi-step linear inequalities in this lesson. Besides typical math questions, you are going to see word problems related to multi-step linear inequalities and money. [8:15]

You will learn how to solve one-step linear inequalities in this video. Besides typical math questions, you are going to see word problems related to one-step linear inequalities and money. [8:15]

Learn how to plot a simple inequality on a number line. The example used in this video is x < 4. [1:34]

Semonstrates how to solve an equation with variables on both sides with the example, (3/4)x + 2 = (3/8)x - 4. [4:50]

This tutorial will highlight that what you do to one side, you have to do to the other in one-step multiplication equations. [2:23]

An introduction to basic algebraic equations of the form ax=b. Check to see if you have the right answer by substituting it for the variable. [11:06]

Learn how to solve one-step addition and subtraction equations that have fractions and decimals in them. [4:32]

Shows how to complete the equation 4(x - 2) + x = 5x + __ so that it has infinitely many solutions. [1:04]

This Khan Academy tutorial shows how to complete the equation -11x + 4 = __x + __ so that it has no solutions. [1:22]

[Free Registration/Login may be required to access all resource tools.] Learn how to recognize and write equations of direct variation and try practice exercises. [11:11]

Showing that a projection onto a subspace is a linear transformation.

Sal solves a word problem about the angles of a given triangle by modeling the given information as a system of three equations and variables.

Sal solves the following age word problem: Arman is 18. Diya is 2. How many years will it take for Arman to be 3 times as old as Diya?

Students are taught to look for patterns in solving mathematical problems. Starting in the lower grades, they learn that math problems can be decomposed and recomposed without its value changing (the distributive property). In these...

Watch [3:26] Sal work through a harder Graphing linear equations problem.

Watch [2:37] Sal work through a basic Graphing linear equations problem.

Watch [2:52] Sal work through a harder solving linear equations problem.

Watch (1.19) Sal work through a basic Solving linear equations problem.

Watch [3:21] Sal work through a harder systems of linear equations word problems.

Write the equation of a line, given its slope and the coordinates of a point on the line including lines parallel to the x- or y-axis. This lesson is 3 of 3 in the series titled "Finding the Equation of a Line given its Slope and a Point."