Proof: Subtraction Example 2

Let's prove the following theorem:

if y = 180 + (90 ⋅ (-1)), then y = 90

Proof:

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Given
1 y = 180 + (90 ⋅ (-1))
Proof Table
# Claim Reason
1 180 + (90 ⋅ (-1)) = 90 180 + (90 ⋅ (-1)) = 90
2 y = 90 if y = 180 + (90 ⋅ (-1)) and 180 + (90 ⋅ (-1)) = 90, then y = 90

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