1. Chapter Sections: 7.1.3 Topic: Graphing a line Vocabulary: When slope is negative the line is pointed down. When a line is pointed down use a slope triangle to find the slope. http://hotmath.com/util/hm_flash_movie.html?movie=/learning_activities/interactivities/function_grap her.swf&return_to=Algebra I Activities&title=Function Grapher

2. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example One Instructions: Make slope triangles to find the slope of the line slope is 5 high 5 wide 3 high 3 wide yint is y = -1x + 10

3. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example Two Instructions: Make slope triangles to find the slope of the line slope = -10 high 5 wide -6 high 3 wide yint is y = -2x + 12

4. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example Three Instructions: Draw a line with y-intercept of 10 and slope triangle going down 2 and 1 wide. Write the equation of the line. slope = -2/1 = -2 y-intercept = 10 y = -2x + 10

5. Classwork One. Instructions: graph the lines on the axis Draw a line with y-intercept of 8 and slope triangle going down 1 and 1 wide. Write the equation of the line. Draw a line with y-intercept of 9 and slope triangle going down 1 and 1 wide. Write the equation of the line. Draw a line with y-intercept of 10 and slope triangle going down 2 and 1 wide. Write the equation of the line. Draw a line with y-intercept of 9 and slope triangle going down 2 and 1 wide. Write the equation of the line. Draw a line with y-intercept of 8 and slope triangle going down 3 and 1 wide. Write the equation of the line.

6. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example One Instructions: Draw a line with y-intercept of 2 and slope triangle 1 high and 3 wide. Write the equation of the line. slope = high/wide = 1/3 y-intercept = 2 y = ⅓x + 2

7. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example Two Instructions: Draw a line with y-intercept of 9 and slope triangle going down 1 and 5 wide. Write the equation of the line. slope = high/wide = -1/5 y-intercept = 9 y = -⅕x + 9

8. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example Three Instructions: Draw a line with y-intercept of 4 and slope triangle 2 high and 3 wide. Write the equation of the line. slope = high/wide = 2/3 y-intercept = 4 y = ⅔x + 4

9. y 13 12 11 10 9 8 7 6 5 4 3 2 1 012345678x Example Four Instructions: Draw a line with y-intercept of 2 and slope triangle 4 high and 5 wide. Write the equation of the line. slope = high/wide = 4/5 y-intercept = 2 y = ⅘x + 2

10. Classwork Two. Instructions: graph two lines on the same axis Draw a line with y-intercept of 2 and slope triangle 1 high and 3 wide. Write the equation of the line. Draw a line with y-intercept of 8 and slope triangle going down 1 and 2 wide. Write the equation of the line. Draw a line with y-intercept of 2 and slope triangle 2 high and 4 wide. Write the equation of the line. Draw a line with y-intercept of 4 and slope triangle 2 high and 2 wide. Write the equation of the line. Draw a line with y-intercept of 2 and slope triangle 3 high and 5 wide. Write the equation of the line. Draw a line with y-intercept of 2 and slope triangle 2 high and 5 wide. Write the equation of the line.