If you are finding it's changes every English System or Metric System or even with a minute or an hour :)
I don't understand what you say. For example {2x+5y=-6
{ X=y
Do I still have to graphed it?

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There's no need for graphing a linear equation with 2 variables.Well,graphing is 'optional'...There's other method in finding the solutions of systems and its "x" and 'y" without using graph by using Elimination Method and Substitution Form.By using this 2 different methods,you could easily derive to the right answer without hesitation...

Hope it Helps:)