Can you help wit this too?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

9is the geometric mean between x and 12

Ken leaves work 20 minutes late. he decides to make up time by taking the toll road instead of side streets. he can travel three times faster by taking the toll road. create an equation to represent his total travel time, including wait time, where x is the number of minutes the drive was expected to take