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Defining a Coordinate System


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Overview

There are times when we need to read points on a coordinate plane.

What is a coordinate plane?

A coordinate plane is two number lines that intersect. The first number line is called the x-axis. It travels horizontally. The second number line is called the y-axis. It travels vertically. The number lines intersect at the origin.

How do you read a coordinate plane?

Each point on the plane is located with a set of coordinates called an ordered pair. The first number in the ordered pair tells you how far to travel across the x-axis from the origin. It’s called the x-coordinate. The second number tells you how far to travel up the y-axis from the x-coordinate. It’s called the y-coordinate.

Let’s give it a try.

Which ordered pair represents Point A on the coordinate plane below?

  1. (5, 2)
  2. (2, 5)

Step 1: Locate Point A

All of the points are labeled. We can see that Point A is red in the coordinate plane.

Step 2: Determine the x-coordinate

We know that the x-coordinate tells us how far to travel across the x-axis from the origin. So, we need to count how far Point A is from the origin.

Step 3: Determine the y-coordinate

We know that the y-coordinate tells us how far to travel up the y-axis from the x-axis. So, we need to count how far Point A is from 2 on the x-axis.

Step 4: Write the ordered pair

We know that the coordinates need to be presented in an ordered pair.

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Use the coordinate plane to answer this question.

Point A is on the __________.

  1. origin
  2. x-axis
  3. y-axis
  4. all of the above

Use the coordinate plane to answer this question.

Point B is on the __________.

  1. origin
  2. x-axis
  3. y-axis
  4. all of the above

Use the coordinate plane to answer this question.

Point C is on the __________.

  1. origin
  2. x-axis
  3. y-axis
  4. all of the above

Use the coordinate plane to answer this question.

What is the y-coordinate of the Point A?

  1. 4
  2. 2
  3. 6

Use the coordinate plane to answer this question.

What is the x-coordinate of the Point A?

  1. 4
  2. 2
  3. 6

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Share good content with friends and get 15% discount for 12-month subscription

Share in facebook Share in twitter
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