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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?

Language:
English Language

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.

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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