Section 1-9 The Coordinate Plane SPI 31A: Identify ordered pairs in a coordinate plane Objectives: Know terms related to the coordinate plane Graph points and identify coordinates on a coordinate plane Analyze data using scatter plots To find your location on a street map, you look in at the grid lines. To locate a point on a coordinate plane, you look at the intersection of grid lines.

0 The Coordinate Plane Vocabulary Origin x-axis(real number line) X y-axis(imaginary number line) Ordered Pair (x, y) coordinates (Read left or right, then up or down) (1, 3) Quadrants: Quadrant I (+, +) (-, +) Quadrant II Quadrant III Quadrant IV (+, -) (-, -) Y

1. Identify coordinate A 2. Identify coordinate B 3. Graph the points: C(0, 3) D(-1, 5) E(3, -2) 4. In which quadrant or on which axis would you find: (-2, 0) (4, -1) (-3, -5) A B Graphing Data on the Coordinate Plane (2, 3) (-3, -1) C D E x-axis Quadrant 4 Quadrant 3

Plotting and Analyzing Data on the Coordinate Plane Scatter Plot graph that relates two sets of data most values are in the first quadrant because the data is usually positive values commonly used in business and data collection surveys Television and Tests Hrs watched Test Scores Hrs watched Test Scores Plot the data from the table, as ordered pair, to show a graphical representation.

Plotting and Analyzing Data on the Coordinate Plane Use the scatter plot to look for trends in data. There are 3 types of relationships data may have: 1. Positive Correlation 2. Negative Correlation 3. No Correlation Positive Correlation Trend line shows sets of data increase together. Negative Correlation Trend line shows one set of data increases as the other decreases. No Correlation Data sets are not related. What type of correlation does the data in the scatter plot for Television and Test scores have?