Alberto uses the steps below to solve the equation.
1/2x - 3 = 7
Step 1: 1/2x - 3 + 3 = 7 + 3
Step 2: 1/2x + 0 = 10
Step 3: 1/2x = 10
Step 4: 2 (1/2) x = 2 (10)
Step 5: 1x = 20
Step 6: x = 20
Which justifies Step 6 of his work?
1. the addition property of equality
2. the identity property of addition
3. the multiplication property of equality
4. the identity property of multiplication
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