# The difference of a number p and -9 is 12.

The difference of a number p and -9 is 12. What is the number?

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Alex Sheppard
p=3
Explanation:
We can write the equation from this word problem by looking at each part of the question.
"The difference of" is saying to subtract what follows.
"a number p and -9 means we have to subtract -9 from p.Remember, we need to subtract a minus 9 or negative nine - so minus a negative number.
We can write this as p-\ -9
In math the word "is" means equal to or =.
And the expression is equal to 12.
Writing the entire problem out gives:
p+9=12
We can rewrite as:
p+9=12
p+9-9=12-9
p+0=3
p=3
###### Not exactly what you’re looking for?
soanooooo40
The difference refers to subtraction. A number can be any number, so we need to use a variable to represent that. The number "2" can stay as it is.
nick1337