1
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Plot 4 comma negative
1, and select

2
00:00:04,170 --> 00:00:07,140
the quadrant in
which the point lies.

3
00:00:07,140 --> 00:00:09,700
So 4, the first
number in our ordered

4
00:00:09,700 --> 00:00:11,130
pair, that's our x-coordinate.

5
00:00:11,130 --> 00:00:14,890
That says how far to move in the
horizontal or the x-direction.

6
00:00:14,890 --> 00:00:16,260
It's a positive 4.

7
00:00:16,260 --> 00:00:18,440
So I'm going to
go 4 to the right.

8
00:00:18,440 --> 00:00:20,030
And then the second
coordinate says,

9
00:00:20,030 --> 00:00:21,654
what do we do in the
vertical direction

10
00:00:21,654 --> 00:00:23,110
or in the y-direction?

11
00:00:23,110 --> 00:00:24,600
It's a negative 1.

12
00:00:24,600 --> 00:00:26,480
Since it's negative,
we're going to go down.

13
00:00:26,480 --> 00:00:29,280
And it's a negative 1, so
we're going to go down 1.

14
00:00:29,280 --> 00:00:32,640
So that right over there is
the point 4 comma negative 1.

15
00:00:32,640 --> 00:00:34,260
So I've plotted
it, but now I have

16
00:00:34,260 --> 00:00:36,860
to select which quadrant
the point lies in.

17
00:00:36,860 --> 00:00:38,810
And this is just a
naming convention.

18
00:00:38,810 --> 00:00:40,410
This is the first quadrant.

19
00:00:40,410 --> 00:00:41,940
This is the second quadrant.

20
00:00:41,940 --> 00:00:43,400
This is the third quadrant.

21
00:00:43,400 --> 00:00:45,330
And this is the fourth quadrant.

22
00:00:45,330 --> 00:00:49,560
So the point lies in the
fourth quadrant, quadrant IV.

23
00:00:49,560 --> 00:00:51,560
And I guess you have to
know your Roman numerals

24
00:00:51,560 --> 00:00:56,280
a little bit to know that's
representing quadrant IV.

25
00:00:56,280 --> 00:00:58,930
Let's do a couple more of these.

26
00:00:58,930 --> 00:01:01,200
Plot 8 comma negative
4, and select

27
00:01:01,200 --> 00:01:03,490
the quadrant in
which the point lies.

28
00:01:03,490 --> 00:01:07,690
Well, my x-coordinate
is 8 so I go 8

29
00:01:07,690 --> 00:01:09,690
in the positive x-direction.

30
00:01:09,690 --> 00:01:14,450
And then my y-coordinate is
negative 4, so I go 4 down.

31
00:01:14,450 --> 00:01:17,740
And this is sitting,
again, in not the first,

32
00:01:17,740 --> 00:01:20,740
not the second, not the third,
but the fourth quadrant,

33
00:01:20,740 --> 00:01:22,626
in quadrant IV.

34
00:01:22,626 --> 00:01:23,750
Let's do one more of these.

35
00:01:23,750 --> 00:01:25,470
Hopefully we get a
different quadrant.

36
00:01:25,470 --> 00:01:28,550
So we want to plot the
point negative 5 comma 5.

37
00:01:28,550 --> 00:01:30,530
So now my x-coordinate
is negative.

38
00:01:30,530 --> 00:01:31,650
It's negative 5.

39
00:01:31,650 --> 00:01:34,660
So I'm going to move to the
left in the x-direction.

40
00:01:34,660 --> 00:01:36,290
So I go to negative 5.

41
00:01:36,290 --> 00:01:39,760
And my y-coordinate
is positive so I go up

42
00:01:39,760 --> 00:01:44,180
5, so negative 5 comma 5.

43
00:01:44,180 --> 00:01:46,170
And this is sitting not
in the first quadrant,

44
00:01:46,170 --> 00:01:47,380
but the second quadrant.

45
00:01:47,380 --> 00:01:49,380
And of course, this is
the third and the fourth.

46
00:01:49,380 --> 00:01:52,190
So this is sitting in
the second quadrant.

47
00:01:52,190 --> 00:01:55,460
Check answer, and
we got it right.