Explain how you know to use a variable in an addition or subtraction expression

Question

Grade 4 math

Answer 1

You use a variable when you dont know what the number is, or you are solving a problem with an assigned variable.

Example:

y:mx+b

b is the y intercept

y is the y axis

x is the x axis

m is the slope

 

OR

 

4+a=12  a=8

Answer 2

You use a variable when you dont know what the number is, so you use a letter as a temporary number.

For example:

4+a=12

We dont know what "a" is, since we already have our answer. so what we do is use "a" as a substitute for a number. We do 12-4 to get our answer, which is a=8

Answer 3

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Answer 4

We use a variable when we dont know a number in the problem..

For Example .   2-Z=1      2+X=3