4. What property justifies the work done in Line 3?
Line 1: 2c + 3C -22 = 78
Line 2: 5c - 22 = 78
Line 3: 5c - 22 + 22 = 78 + 22
Line 4: 5c = 100
Line 5: C = 20

O Subtraction Property of Equality
Commutative Property of Addition
o Associative Property of Addition
Addition Property of Equality

The addition property of equality justifies the work done in Line 3. This is because it essentially states that if you add something to one side of an equation, you must add it to the other side as well. In this case, we are adding 22 to both sides of the equation, therefore we are making use of the Addition Property of Equality.

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4. What property justifies the work done in Line 3? Line 1: 2c + 3C -22 = 78 Line 2: 5c - 22 = 78 Line 3: 5c - 22 + 22 = 78 + 22 Line 4: 5c = 100 Line 5: C = 20 O Subtraction Property of Equality Commutative Property of Addition o Associative Property of Addition Addition Property of Equality

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4. What property justifies the work done in Line 3?
Line 1: 2c + 3C -22 = 78
Line 2: 5c - 22 = 78
Line 3: 5c - 22 + 22 = 78 + 22
Line 4: 5c = 100
Line 5: C = 20

O Subtraction Property of Equality
Commutative Property of Addition
o Associative Property of Addition
Addition Property of Equality