
Substitution for Variables in Expressions  Hockey Theme  Game Tips:  Get 5 correct answers and see the substitute skater !  The word 'expression' in Mathematics has a very general meaning. An expression can be any mathematical form using symbols. For example: (y+5)  The expression (y+5) uses the variable 'y'. The variable 'y' is a 'place holder' or symbol representing a member of a set.  In this game, a variable such as 'y' represents a number from the whole number set.  The focus of this game is to substitute the number value of a variable, such as y=7 into an expression containing the variable, such as (y+5) in order to evaluate the expression. In this case it's (7+5) = 12.  It may take a minute to load the game at dialup speeds.  The game can be played using the mouse by itself or using the keyboard by itself.  If the game doesn't respond to keyboard input, click inside the game area to reset the game's focus.  The game speeds up as your score increases. Adjust this with the  and + keys. 
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