Main content

## Class 9 (Foundation)

### Course: Class 9 (Foundation) > Unit 8

Lesson 2: Coordinate plane word problems# Plotting corners of a rectangle

Sal plots the corners of a rectangle on the first quadrant of a coordinate plane.

## Want to join the conversation?

- Thanks. Hit it still kind of confuses me because it says what the unit and than. Add or up but is says I’m wrong than says you have to subtract one why............

Help please(3 votes)- Can you quote an example problem that you're having difficulty with?

If you can give me specifics then I can try to explain what it means. :)(3 votes)

- i dont get some stuff like the x and y because once the number in the left was x and another one was y and that is why dont get this lesson.(4 votes)
- i dont get it is thier a easyer way ?(3 votes)
- A point particle (ideal particle or point-like particle, often spelled pointlike particle) is an idealization of particles heavily used in physics. Its defining feature is that it lacks spatial extension: being zero-dimensional, it does not take up space.(2 votes)
- ok do you know this problem here it is if you had 4 dots on a Quadrilateral and one was stuck in place but the other 3 are able to move then what would I do the one that is stuck in 17,14 and it asks me to put 1 in a place but it doesn't tell you to do anything to the other 2 what would I do would I make a shape?(1 vote)
- wait but I don't get it what about the zero do you count that too(0 votes)
- how do you play the video(0 votes)

## Video transcript

- [Instructor] The four
corners of a rectangle are located at the points
(11,7), (11,0), (2,0), and (2,7). Plot the four corners of the
rectangle on the coordinate plane below, and they have these dots and we can actually move these
around for the four corners of our rectangle. So let's look at this first point: (11,7). Where will that go? Well let's just remind
ourselves that the first coordinate here, that is our x-coordinate. That tells us how far we
move in the x-direction, or how far we move to the right. So our x-coordinate is 11, so we can say, we can start at the origin
and move 11 to the right and then our y-coordinate
is seven, which says hey we need to move seven up from there. So one, two, three,
four, five, six, seven. So notice, 11, that's if
you were to just drop a line straight down you would
hit the x-axis at 11 and the y-coordinate, if you
were to take a horizontal line, if you were to go
straight to the left, you get to y equals seven. So this is the point (11,7). Alright let's do the next one. Then you have (11,0). So let's line, lemme take
this point right over here. So the x-coordinate is once
again 11, but the y-coordinate is zero, which means we don't
move up at all in the ... Or we don't move up at all. One way to think about
it, start at the origin, you move 11 to the right
and you move zero up. So this is going to sit on
the x-axis right over there (11,0). Alright then we have (2,0). So x-coordinate is two and
we don't move up at all. So we're gonna sit on the x-axis. We move two to the right and zero up, or you can think of it zero
up and two to the right. Then we have (2,7). So x-coordinate is two,
but then we wanna move ... X-coordinate is two, then
we wanna move seven up to get right over there,
and so you can see the corners of a rectangle right over here and then they ask us, what is
the height of the rectangle? Well let's see. If we're going from y equals
zero to y equals seven, so the height is seven. You could even count it,
one, two, three, four, five, six, seven. So the height of the rectangle is seven. And then of course I can check my answer and I got it right.