she made an error in the third step. The correct answer is - 9.7b + 25
How to add linear expression?
(-4.23b + 13) - (5.47b - 12)
Therefore, let's open the bracket on the right side.
-4.23b + 13 - 5.47b + 12
Hence, let's combine the like terms
-4.23b + 13 - 5.47b + 12
-4.23b - 5.47b + 12 + 13
Do the arithmetic of the like terms
-4.23b - 5.47b + 12 + 13
- 9.7b + 25
Therefore, she made an error in the third step.
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