You would simply add the last two equations together. If v=2x+1 and t=4x-1, you can add them up. This would make 2x+1+4x-1. If you combine like terms, 1 and -1 cancel out and you are left with 6x. This means x can be anything.
Answer:
1/2
Solution: plugging in the given information into the formula you get 2/4 which simplifies to 1/2
The awnser is d inequality.