Select the reason that proves this statement
Question
Theorem: If a + c = b + c, then a = b.
1. Identity property of addition
2. Property of opposites
3. Given
4. Commutative property of addition
5. Associative property of addition
Addition property of equality
A number c’ is called the additive inverse for c if c + c’ = 0 where 0 is the “identity element”.
The identity property of addition is the existence of the element ‘0’ such that for any elementc, c +0 = c.