Statements
Reasons
1. given
2. segment addition
3. addition property of equality
4. subtraction property of equality
5. given
6. subtraction property of equality
Where is the first error in this proof?
The reason in line 6543 does not justify the statement because more than two segments were added, values were not subtracted from each side, and values were not added to each side. Instead, the reason should be given as segment addition or the substitution property of equality.