Sometimes a graphical explanation is rquired, here is an excellent picture illustrating how you may solve the equations simultaneously using a graphical method. It may help to know that the two equations here are y = 2x-1 and y = 5 - x (also written x + y = 5). The solution which can clearly be seen from the diagram is x = 2 and y = 3. These are the coordinates of the point of intersection.
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