This preview shows page 1. Sign up to view the full content.
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 http://tutorial.math.lamar.edu/terms.aspx 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...
View Full Document
- Spring '12