← Variable or Constant - College Algebra

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Showing Revision 3 created 05/25/2016 by Udacity Robot.

1. Lets go through the terms, 1 by 1, to
figure out what type each of them is. So
2. first we have y, y is not just a number,
so that means it cant be a constant term.
3. And we also know, that y is a frequently
used letter, to represent variables in
4. Algebra. So, y is a variable term. Then we
have 3 million. There are no symbols,
5. other than numbers in this term. And
we know that 3 million is a number, we
6. know how big it is already, so this has a
constant value, that means that its a
7. constant term. And lastly we have negative
-100,000x. Note that the negative sign
8. belongs with the term itself, so we dont
say that the term is 100,000x, we say that
9. it is -100,000x, anyway, this term has two
parts, it has a part with a number and a
10. part with a variable. As we talked about
before though if a term has a variable in
11. it at all, then that term counts as a
variable term. When we plug in numbers for
12. x -100,000x is going to change values
because of what we plug in. So the whole
13. term despite have a number in it counts as
a variable term.