Question

What belongs in the box marked with the question mark in the proof?

Given: 3x - 4 = 2(x + 8), Prove: x = 20
1. 3x - 4 = 2(x + 8) | 1. ______________
2. 3x - 4 = 2x + 16 | 2.______________
3. 3x = 2x + 20 | 3. ______________
4. x = 20 | 4. ____?_________
( What is the process called like what did they do to 3 to get 4 )

Answer 1

Given: 3x - 4 = 2(x + 8), Prove: x = 20
1. 3x - 4 = 2(x + 8) | 1. ___Given___________
2. 3x - 4 = 2x + 16 | 2.___Distributive property___________
3. 3x = 2x + 20 | 3. ___addition property of equality_____________
4. x = 20 | 4. ___subtraction property of equality_____________