Prove: if a+c=b+c, then a=b.
Statement 1: a+c=b+c
Statement 2: a+c+(-c)=b+c+(-c)
Statement 3: a+[c+(-c)]=b+[c(-c)]
Statement 4: a+0=b+0
Statement 5: a=b.
What is the reason for Statement 2?
a. Property of opposites
b. Associative property of addition
c. Addition property of equality
d. Identify property of addition