Date: Mon, 11 May 1998 14:29:30 EDT
Subject: Graph question

I have a question about graphs.


Why is the point of intersection of two lines the solution to the corresponding system of equations?


Since the point (3,4) satisfies the equation y = 3 x - 5, the point is on the graph of the equation. Conversely, if a point is on the graph of an equation then the point satisfies the equation. When you find the solution of a system of two equations you are finding all the points that satisfy BOTH equations. Since the point you find satisfies both equations it is on both graphs.


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