Slot Machine Simulator
When comparing against "yes" or "no", you should consider using equalsIgnoreCase so that answers like YES can be accepted. (Perhaps the player is excited to play?)
startGame: I cannot tell what the x argument is.  It should be renamed.
gamePrize: Rather than hard-coding the 1-6 figures in your switch statement, you should make each one a constant (ex. VAL_ORANGE).
result: I would not know that you arguments are the number of occurrences of each type.  These should probably be renamed.
result: You currently have 1 cherry as winning $7 and 3 as winning $2.  This appears to be a bug.