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Addition and Subtraction Videos 7 videos
Solving two-step equations can be tricky, but at least they’re easier than doing the Texas Two-Step. We trip over our feet so often you’d think...
Sometimes, we just want fewer y's...or more x's. That's why it's great to know how to add and subtract variables. In real life, though, we try to a...
What's easy, simple, and comfortable? Adding and subtracting double digit numbers. What's not-so-easy, the opposite of simple, and definitely not c...
SAT Math 3.6 Numbers and Operations 229 Views
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Description:
SAT Math 3.6 Numbers and Operations
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
Full Transcript
- 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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