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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 )

Respuesta :

choixongdong
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_____________

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