Commutative Property Variation 1
Substitution 2
Substitution 6
Algebra 4

Proof: Algebra 4

Let's prove the following theorem:

if the following are true:
  • x = 12
  • d = x + 13

then d = 25

Proof:

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Given
1 x = 12
2 d = x + 13
Proof Table
# Claim Reason
1 d = 12 + 13 if d = x + 13 and x = 12, then d = 12 + 13
2 12 + 13 = 25 12 + 13 = 25
3 d = 25 if d = 12 + 13 and 12 + 13 = 25, then d = 25
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