Main content

## Basic geometry and measurement

### Course: Basic geometry and measurement > Unit 7

Lesson 1: Intro to the coordinate plane# Coordinate plane: graphing points

Sal graphs ordered pairs, such as (8, 10) in quadrant 1 on a coordinate plane. Created by Sal Khan.

## Want to join the conversation?

- Why would I need to know this in real life?(28 votes)
- To draw a graph(1 vote)

- Does anyone else just scroll through the comments?(14 votes)
- how do you use graphing in your everyday life?(11 votes)
- graphing can be used to look at patterns and correlations in data sets. once, at school, we looked to see if there was a correlation between attendance and ranking in major league baseball. what we found was that most of the time the more people who went to see a team, the higher the teams ranking was (or the other way around). graphing can be used in businesses to do things like track sales or see if some things are over all better than others. basically, graphing has hundreds of different purposes.(1 vote)

- Its earth worm sally. Caried diseases from flordia to cally. Flordia to cally(6 votes)
- Its earth worm sally, carrying diseases from florida to cali!(4 votes)

- What is a plot?(0 votes)
- A plot would be the 2 points you need to graph. He plotted (8, 10) and (6, 10) So he had two plots to graph.(17 votes)

- this is not free vbucks(6 votes)
- here is 100000000000000000000000000 v bucks just go to youdontknowwhoiam.org.(1 vote)

- what does it mean when it says not graphed(4 votes)
- Why there has to be a y axis and x axis(1 vote)
- so the computer can understand it better and because y axis is different from x axis(7 votes)

- How do you use this in everyday life.(3 votes)
- So I actually use these types of grids all the time in game development and CGI creation.

Graphs are used for MANY things including displaying statistics(1 vote)

## Video transcript

We are asked to plot 8 comma 10. So the first number in
this ordered pair, this is our x-coordinate. This tells us how far do
we move in the x direction. It's a positive 8, so we
move 8 in the x direction. And then the second number
in our ordered pair is 10. That is our y-coordinate. That tells us how far we
move in the y direction. Since it's positive,
we move up 10. So we move up 10, all
the way over here. And you could have thought
about it either way. You could have said, hey,
look this is our y-coordinate. This is 10. So I could move up 10. And then my x-coordinate
is positive 8. So I'll move 8 along
the positive x-axis, or I'll move 8 to the right. You see right over
here I have moved 8 to the right-- 1,
2, 3, 4, 5, 6, 7, 8. And I have moved 10 up-- 1,
2, 3, 4, 5, 6, 7, 8, 9, 10. You might be tempted to
move 8 up and then 10 to the right, which
would put you there. But then you would have had
the two numbers mixed up. You would have had the x and
the y-coordinates mixed up. The 8 tells you how far to move
in the horizontal direction. The 10 tells you how far to
move in the vertical direction. Let's do a couple more of these. Plot 6 comma 10. Well once again, the first
number in the ordered pair is the x-coordinate, how far
we move in the x direction. So we move 6 to the right. And then the second
number, the 10, tells us our vertical
coordinate, our y-coordinate. So it's positive 10. So we move 10 up. Let's do one more-- 5 comma 7. So my horizontal coordinate is
5, so I move 5 to the right. And then my vertical one is
7, or my y-coordinate is 7. So I move 7 up-- 1,
2, 3, 4, 5, 6, 7. And as long as you remember
which one is horizontal and which one is vertical or
which one is the x-coordinate and which one is the
y, you should be fine. You could say, hey look,
this is my y-coordinate, 7. So I'm going to move 7 up. And my x-coordinate is 5, so I'm
going to move 5 to the right. And it will get you to
that exact same point. This specifies exactly one
point in the coordinate plane.