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Coordinate Geometry Videos 38 videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
In geometry, points are called collinear if they all lie on the same line. What, no bunk beds?
ACT Math 2.2 Coordinate Geometry 208 Views
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Description:
ACT Math: Coordinate Geometry Drill 2, Problem 2. Which expression is depicted by the number line?
- Coordinate Geometry / Number line graphs
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Chinese Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Coordinate Geometry / The relations between equations and graphs
- Coordinate Geometry / Graphing inequalities
Transcript
- 00:02
Here's your shmoop du jour...
- 00:04
Which expression is depicted by the number line?
- 00:06
And here are your potential answers...
- 00:10
Well, it's really all about knowing the distinction between greater than and greater
- 00:14
than OR EQUAL TO.
Full Transcript
- 00:20
In this case, we can just derive our own equation to describe this line.
- 00:25
We'll start with the x, which is gonna live here on the line inside these two points.
- 00:29
And note that the points are described with filled-in circles - not empty ones.
- 00:34
The fact that the circles are filled in means that the points are greater than or equal
- 00:38
to... or less than or equal to.
- 00:41
So another little curve ball they throw at you - the 7/8 here is left of the 0... i.e.,
- 00:46
it's negative.
- 00:48
So x is gonna have to be greater than or equal to negative 7/8.
- 00:52
On the right we see the 1/8, which x is less than or equal to.
- 00:57
And the only one that works... is A.
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