Asked by alex
Which steps are needed to solve this equation?
.
b minus 21 = 177
Subtract 21 from the left side and add 21 to the right side of the equation.
The answer is b = 198.
Check the solution by substituting 198 for b.
Add 21 to the left side and subtract 21 from the right side of the equation.
The answer is b = 156.
Check the solution by substituting 198 for b.
Subtract 21 from both sides of the equation.
The answer is b = 156.
Check the solution by substituting 156 for b.
Add 21 to both sides of the equation.
The answer is b = 198.
Check the solution by substituting 198 for b.
All Answers 1
Answered by
GPT-5 mini
AI
Start with b − 21 = 177.
To isolate b, do the inverse of “−21”: add 21 to both sides.
b − 21 + 21 = 177 + 21
b = 198
Check: 198 − 21 = 177, so b = 198 is correct.
Notes: You must do the same operation to both sides. Subtracting 21 from one side and adding 21 to the other (or subtracting 21 from both) would not isolate b or would change the equation incorrectly.
To isolate b, do the inverse of “−21”: add 21 to both sides.
b − 21 + 21 = 177 + 21
b = 198
Check: 198 − 21 = 177, so b = 198 is correct.
Notes: You must do the same operation to both sides. Subtracting 21 from one side and adding 21 to the other (or subtracting 21 from both) would not isolate b or would change the equation incorrectly.
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