Question 989798
The property that best justifies Gabrielle's first step is the addition property of equality. This allows you to add four on the left side of the equal sign to cancel it out. In order to be fulfill the property, what you do to one side you must do to the other so you add that same amount (4) to the right side of the equal sign.


3x-4 = 5

(3x-4) +4 = 5 + 4 

3x = 9


Final Answer: Addition Property of Equality



Hope this helped!