For the first one we simply plug x 2 into the

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Unformatted text preview: ed pair of the form ( x, y ) . The first number listed is the x-coordinate of the point and the second number listed is the y-coordinate of the point. The ordered pair for any given point, ( x, y ) , is called the coordinates for the point. The point where the two axes cross is called the origin and has the coordinates ( 0, 0 ) . Note as well that the order of the coordinates is important. For example, the point ( 2,1) is the point that is two units to the right of the origin and then 1 unit up, while the point (1, 2 ) is the point that is 1 unit to the right of the origin and then 2 units up. © 2007 Paul Dawkins 153 College Algebra We now need to discuss graphing an equation. The first question that we should ask is what exactly is a graph of an equation? A graph is the set of all the ordered pairs whose coordinates satisfy the equation. For instance, the point ( 2, -3) is a point on the graph of y = ( x - 1) - 4 while (1,5 ) isn’t on 2 the graph. How do we tell this? All we...
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