Quiz (1 point)

• if a + 90 = 180, then 180 + (90 ⋅ (-1)) = a

• if 180 + (90 ⋅ (-1)) = y, then 90 = y

• if a = b, then b = a

Please write your proof in the table below. Each row should contain one claim. The last claim is the statement that you are trying to prove.

Step	Claim	Reason (optional)	Error Message (if any)
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