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Basic Operations Videos 58 videos

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SAT Math 7.3 Algebra and Functions

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SAT Math 3.6 Numbers and Operations 208 Views


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Description:

SAT Math 3.6 Numbers and Operations

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it...

00:05

If a + b = 12, b + c = 17, and a + c = 9, what is the value of a + b + c?

00:14

And here are the potential answers...

00:18

If we push our way through the annoying crowd of variables...

00:21

...we'll find that what this question is actually asking

00:24

is just for us to sum a, b, and c.

00:28

What if... we add up all three of the equations that are given to us?

00:32

In that case, we get a + b + b + c + a + c equals 12 + 17 + 9.

00:42

And if we combine all like terms...we get 2a + 2b + 2c equals 38.

00:52

Next, we can distribute the 2 to make the equation 2 times the quantity a + b + c... equals 38.

00:59

Divide both sides by 2, and our equation looks like this: a + b + c = 19.

01:04

Answer B.

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