Question

A conjecture and a portion of the flowchart proof used to prove the conjecture are shown.

https://gyazo.com/02dd35ef9681227d16c23305466bf3c2

Which equation best represents the information that should be in the box labeled 1?

3x = 9

3x = 26

3x = 27

3x = 30

Answer 1

\(\large\rm 3x-1=26\)

Addition Property of Equality tells us that we can add the same amount to both sides of an equation and it will stay balanced (true).

In this case, we would like to isolate the 3x,
so we'll add 1 to each side.
What happens when you do that?