0:00:00.000,0:00:00.820


0:00:00.820,0:00:04.170
Plot 4 comma negative[br]1, and select

0:00:04.170,0:00:07.140
the quadrant in[br]which the point lies.

0:00:07.140,0:00:09.700
So 4, the first[br]number in our ordered

0:00:09.700,0:00:11.130
pair, that's our x-coordinate.

0:00:11.130,0:00:14.890
That says how far to move in the[br]horizontal or the x-direction.

0:00:14.890,0:00:16.260
It's a positive 4.

0:00:16.260,0:00:18.440
So I'm going to[br]go 4 to the right.

0:00:18.440,0:00:20.030
And then the second[br]coordinate says,

0:00:20.030,0:00:21.654
what do we do in the[br]vertical direction

0:00:21.654,0:00:23.110
or in the y-direction?

0:00:23.110,0:00:24.600
It's a negative 1.

0:00:24.600,0:00:26.480
Since it's negative,[br]we're going to go down.

0:00:26.480,0:00:29.280
And it's a negative 1, so[br]we're going to go down 1.

0:00:29.280,0:00:32.640
So that right over there is[br]the point 4 comma negative 1.

0:00:32.640,0:00:34.260
So I've plotted[br]it, but now I have

0:00:34.260,0:00:36.860
to select which quadrant[br]the point lies in.

0:00:36.860,0:00:38.810
And this is just a[br]naming convention.

0:00:38.810,0:00:40.410
This is the first quadrant.

0:00:40.410,0:00:41.940
This is the second quadrant.

0:00:41.940,0:00:43.400
This is the third quadrant.

0:00:43.400,0:00:45.330
And this is the fourth quadrant.

0:00:45.330,0:00:49.560
So the point lies in the[br]fourth quadrant, quadrant IV.

0:00:49.560,0:00:51.560
And I guess you have to[br]know your Roman numerals

0:00:51.560,0:00:56.280
a little bit to know that's[br]representing quadrant IV.

0:00:56.280,0:00:58.930
Let's do a couple more of these.

0:00:58.930,0:01:01.200
Plot 8 comma negative[br]4, and select

0:01:01.200,0:01:03.490
the quadrant in[br]which the point lies.

0:01:03.490,0:01:07.690
Well, my x-coordinate[br]is 8 so I go 8

0:01:07.690,0:01:09.690
in the positive x-direction.

0:01:09.690,0:01:14.450
And then my y-coordinate is[br]negative 4, so I go 4 down.

0:01:14.450,0:01:17.740
And this is sitting,[br]again, in not the first,

0:01:17.740,0:01:20.740
not the second, not the third,[br]but the fourth quadrant,

0:01:20.740,0:01:22.626
in quadrant IV.

0:01:22.626,0:01:23.750
Let's do one more of these.

0:01:23.750,0:01:25.470
Hopefully we get a[br]different quadrant.

0:01:25.470,0:01:28.550
So we want to plot the[br]point negative 5 comma 5.

0:01:28.550,0:01:30.530
So now my x-coordinate[br]is negative.

0:01:30.530,0:01:31.650
It's negative 5.

0:01:31.650,0:01:34.660
So I'm going to move to the[br]left in the x-direction.

0:01:34.660,0:01:36.290
So I go to negative 5.

0:01:36.290,0:01:39.760
And my y-coordinate[br]is positive so I go up

0:01:39.760,0:01:44.180
5, so negative 5 comma 5.

0:01:44.180,0:01:46.170
And this is sitting not[br]in the first quadrant,

0:01:46.170,0:01:47.380
but the second quadrant.

0:01:47.380,0:01:49.380
And of course, this is[br]the third and the fourth.

0:01:49.380,0:01:52.190
So this is sitting in[br]the second quadrant.

0:01:52.190,0:01:55.460
Check answer, and[br]we got it right.