Section: Math

99) If 3x-1=11, what is the value of 3x+1?

1. 10
2. 11
3. 12
4. 13

Answer 4 is correct. First, solve for 3x-1=11 by adding 1 to each side, 3x=12. Divide both sides by 3 to isolate the variable, and you get x=4. Now plug in four to the other equation. 3(4)+1=13.