Let's prove the following theorem:

if the following are true:

then d = 25

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 (Term 1 Substitution)
2	12 + 13 = 25	12 + 13 = 25 (Fixed Value Statement)
3	d = 25	if d = 12 + 13 and 12 + 13 = 25, then d = 25 (Transitive Property of Equality)

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