Question 628464: Here is my question....How would I know, in a linear story problem, that I would need to use X and Y variables or I could use only X variable? I cannot seem to grasp the relationships in the problems that would tell me to only use X or to use X and Y. And my instructor was not able to explain it either. Thank you for your help. Answer by jim_thompson5910(28595) (Show Source):
You can put this solution on YOUR website! If you have two unknown quantities, then you would use two variables to represent them (eg: length and width). If you have one unknown quantity, then you would use one variable (eg: time)
Without the actual specific problem, there's not much more I can say about it.