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.

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Chapter Sections: 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. her.swf&return_to=Algebra I Activities&title=Function Grapher

y x 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

y x 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

y x 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

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.

y x 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

y x 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

y x 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

y x 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

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.