What is the correct reason for statement 1 in the proof? Prove: if ac=bc and c≠0, then a=b . 1. ac=bc 1. 2. (ac)⋅1c= (bc) ⋅1c 2. 3. (a⋅c) ⋅1c= (b⋅c) ⋅1c 3. Definition of multiplication 4. a (c⋅ 1c)= b(c ⋅ 1c ) 4. 5. a ⋅ 1= b ⋅ 1 5. Property of reciprocals 6. a = b 6. Division Property of Equality Substitution Property Multiplication Property of Equality Given