# The Rectangular Coordinate System

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A series of free, online Intermediate Algebra Lessons or Algebra II lessons.

Videos, solutions, worksheets, and activities to help Algebra students.

In this lesson, we will learn

- about the rectangular coordinate system
- how to use the midpoint formula

## Rectangular Coordinate System

In Algebra, we often use the rectangular coordinate system to graph lines, parabolas and other formulas. Important terms to be familiar with include the y-axis, the x-axis, y-coordinates, x-coordinates and points.The rectangular coordinate system can also be called the coordinate system or the x-y axis.

How to talk about the rectangular coordinate system.

Introduction of Coordinate System

**How to use the Midpoint Formula?**
A midpoint is the halfway point between two points on a coordinate axis. To calculate the midpoint, we use the midpoint formula which is the average of the x-values and the average of the y-values. To find the average, we add the x-values and divide by two and add the y-values and divide by two. One thing we need to be careful of when calculating the midpoint is to make sure to calculate the negative coordinates accordingly.

The Midpoint Formula

This video gives the formula for finding the midpoint of two points and do one simple example to find the midpoint.

The Midpoint Formula - Finding the Midpoint

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