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Playlist CAHSEE Math Test Prep: Algebra I 30 videos
CAHSEE Algebra I: Drill 1, Problem 1. What are some of the properties used to solve this equation?
CAHSEE Math Algebra I: Drill 1, Problem 2. Find the negative reciprocal.
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?
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.
Full Transcript
- 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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