Graphing Linear Equations: Slope-Intercept Form

Graphing Linear Equations: Slope-Intercept Form

Introduction

Linear equations help us describe relationships that change at a constant rate. You might use them to track the cost of a monthly subscription, distance traveled over time, or money saved each wee...

Ryan buys a pack of 3 identical pens, each priced the same, and a $6 notebook for a total of $15 and wonders, “What is the price of one pen?”

To find it, Ryan decides to use a graphical method. He lets x represent the price of one pen, and y represent the total cost.

Ryan writes the equation y = 3x + 6, which follows the slope-inter...