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Playlist CAHSEE Math Test Prep: Algebra I 30 videos

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CAHSEE Math 1.1 Algebra I
262 Views

CAHSEE Algebra I: Drill 1, Problem 1. What are some of the properties used to solve this equation? 

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CAHSEE Math 1.2 Algebra I
236 Views

CAHSEE Math Algebra I: Drill 1, Problem 2. Find the negative reciprocal.

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CAHSEE Math 1.3 Algebra I
245 Views

Algebra I Drill 1, Problem 3. Solve the equation.

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CAHSEE Math 5.2 Algebra I 260 Views


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Description:

Algebra I Drill 5, Problem 2. Which of the coordinates is a solution to the following system of equations?

Language:
English Language

Transcript

00:03

Here’s your shmoop du jour…

00:05

Which of the coordinates is a solution to the following system of equations?

00:10

Here are the potential answers…

00:14

So… what is this question asking?

00:16

It’s all about substitution. In other words… we can have a soy burger instead of processed cow meat.

00:24

But in this kind of substitution, everywhere we see a y here, we can put in a 2x and simplify

00:30

our life a bit by getting a real number for y.

00:34

So we rewrite the equation like this – and we have

00:36

4x minus 3 times 2x equals negative 24.

00:41

Simplify even further and we get 4x minus 6x equals negative 24.

00:47

We have negative 2x equals negative 24… so we can multiply both sides by negative

00:52

1 to get 2x equals 24… or x equals 12.

00:56

Now we can just substitute the 12 times 2 to get 24 for our y value.

01:00

So we get 12 and 24… and our answer is C.

01:03

As in, “Crapburger.”

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