Jamal uses the steps below to solve the equation 6x – 4 = 8.
Step 1: 6x – 4 + 4 = 8 + 4
Step 2: 6x + 0 = 12
Step 3: 6x = 12
Step 4: =
Step 5: 1x = 2
Step 6: x = 2
Which property justifies Step 3 of his work?
the addition property of equality
the identity property of addition
the multiplication property of equality
the identity property of multiplication
