# SOLUTION: 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 relations

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 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.