Linear functions are usually written in either slope-intercept form or standard form. We need a thorough and flexible understanding of these forms in order to approach many SAT questions …

This topic covers: - Intercepts of linear equations/functions - Slope of linear equations/functions - Slope-intercept, point-slope, & standard forms - Graphing linear equations/functions - Writing …

If you start seeing things where the components start getting multiplied by each other or you start seeing squares or exponents, you're probably not dealing with a linear transformation. And …

Sal finds a linear expression that approximates y=1/ (x-1) around x=-1. This is done by finding the equation of the line tangent to the graph at x=-1, a process called "linear approximation."

To solve linear equations, find the value of the variable that makes the equation true. Use the inverse of the number that multiplies the variable, and multiply or divide both sides by it. …

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Practice Equations with variables on both sides Get 3 of 4 questions to level up!

This is showing us how to calculate each of the "elements" of the equation shown above when we only know two points

It's helpful that the equations lead into each other. First is point-slope, then slope-intercept, and lastly standard form.

Learn about the slope-intercept form of two-variable linear equations, and how to interpret it to find the slope and y-intercept of their line.