Question

Simply the expression.

-9+7z+2-3z=

Answer 1

Combine like terms together.
Terms that have z in them are like terms.
Terms that don't have z are like terms.
-9 + 7z + 2 - 3z =
-9 + 2 + 7z - 3z =

Answer 2

?

Answer 3

$$a+b=b+a$$

Answer 4

What is -9 + 2?

Answer 5

-11

Answer 6

That is -9 - 2. What is -9 + 2?

Answer 7

+11

Answer 8

No. Let's say the temperature was -9 degrees and it went up 2 degrees. What is the temperature now?

Answer 9

9

Answer 10

@SeanAcedia What does 7 + (-2) have to do with this other than adding more confusion?

Answer 11

ok,iam confused

Answer 12

@sjackson Let's say the temperature was -9 degrees and it went up 2 degrees. What is the temperature now?

Answer 13

11 correct?

Answer 14

No. The temperature was not 9 degrees, It was -9 degrees. Then it went up 2 degrees. What is it now?

Answer 15

-11

Answer 16

Here's another way of thinking of negative numbers. I owe you 9 dollars, so you can think of me having -9 dollars. Now I pay you back 2 dollars. How much do I owe you now?

Answer 17

-7

Answer 18

Right.
-9 + 2 = -7
Now the part with the variable z:
What is 7z - 3z = ?

Answer 19

4z

Answer 20

Right.
So the final answer is:
-9 + 7z + 2 - 3z =
-7 + 4z

Answer 21

11z

Answer 22

Remember what I wrote at the top. You can only combine like terms. Like terms have the same variable part. Terms with z are like terms. Terms without z are like terms. Terms with z and terms without z are not like terms and can't be combined together. The final answer is
-7 + 4z
You can't do anything else to this.

Answer 23

there not like terms if a number has a letter in it and another number doesnt have a letter in it they cant be put together.

Answer 24

Why 11z?

Answer 25

@skullpatrol It's the incorrect addition of -7 and 4

Answer 26

@sjackson -7 + 4z can not be simplified further, do you know why?