Math 015 Section 6.5 The Coordinate System. Quadrant IQuadrant II Quadrant III Quadrant IV Origin x-axis y-axis.

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Presentation transcript:

Math 015 Section 6.5 The Coordinate System

Quadrant IQuadrant II Quadrant III Quadrant IV Origin x-axis y-axis

Each point in the plane can be identified by an ordered pair The ordered pair tells the location of the point with reference to the origin Example: (5, 7) The numbers in the ordered pair are called the coordinates of the point 5 is the x-coordinate or abscissa 7 is the y-coordinate or ordinate The graph of a point is a dot placed at the location of the point (5, 7)

Graph the following ordered pairs: A(-2, -3) B(3, -2) C(0,2) D(-3,0) A B C D y x

Give the coordinates of A and B A B C D y x Give the abscissa of C Give the ordinate of D Answers: Coordinates of A are (-4,2) Coordinates of B are (4, 4) Abscissa of C is -1 Ordinate of D is 1

Objective: To graph and interpret a scatter diagram The number of miles, in thousands, a rental car is driven and the cost to service that vehicle were recorded by the manager of the rental agency. The data are recorded in the following table. Graph the scatter diagram of the data. Miles Cost of service

Objective: To interpret information from a scatter diagram. The scatter diagram at the right pairs number of children with the number of U.S. presidents who had that number of children How many presidents had 5 children? 7 How many presidents had 2 children? 8 How many presidents had at least 6 children? 8