Drawing Graphs Unit 7 Lesson 4 Note You

Drawing Graphs Unit 7, Lesson 4 *Note: You will need graph paper today

An Example n On December 26, 2004, a massive underwater earthquake rocked the coast of Indonesia’s Sumatra Island. It caused a tsunami, or huge ocean waves. This table shows the height of the waves at different distances from land.

Height of Waves (m) To Display This Data… 40 30 20 10 20 30 Distance from Land (km) 1. Draw two axes (one axis, two axes), one horizontal and one vertical. The horizontal axis shows the independent variable, Distance From Land. The vertical axis shows the dependent variable, Height of Waves. 2. Choose an appropriate scale. • Horizontal – Data goes to 30. Count by 5. • Vertical – Data goes to 32. Count by 5.

To Display This Data… Height of Waves (m) Height of Waves in a Tsunami 40 30 20 10 20 30 Distance from Land (km) The farther the wave from land, the less the height of the wave. 3. To mark our first data point, we find 5 km on the horizontal axis, and travel up to 32 on the vertical axis. 32 is 2/5 of the way from 30 to 35. Plot the point 2/5 of the way between the lines that represent 30 and 35. 3 a. Continue to mark data points in the same way, by finding the value on the horizontal axis and travelling up to the value of the vertical axis. 4. Because (If) the data is continuous, we can join the points together with a line. If the data is discrete, we do not join the points. 5. Finally, give your graph a title.

Your Turn

Does your graph look like this? Distance Travelled on Road Trip Title 600 Distance Travelled (km) Vertical Scale Data points accurate 500 400 Line connecting points (drawn with a ruler) 300 200 Dependent Variable 100 0 Horizontal scale 1 2 3 4 5 6 7 8 Time Passed (h) Independent Variable

Practice Makes Perfect n Workbook – p. 94, 95