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Advocard [28]
4 years ago
15

How do you know if it is a adding or subtraction problem when you combine like terms?

Mathematics
1 answer:
Snowcat [4.5K]4 years ago
4 0
You look at the sign behind the second term. Here are some examples...

2x + 8 - 4x 
You are going to subtract 2x - 4x because there is a negative sign behind the 4x.

8y + 1 + y
You are going to add 8y + y because there is a positive sign behind the y.

4 + 2x - 5 + 7x
You are going to subtract 4 - 5 because there is a negative sign behind the 5.
You are going to add 2x + 7x because there is a positive sign behind the 7x.
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