12.5Notes.notebook January 09, 2014 12.5: Proportional Relationships and Direct Variation For direct variation, two variable quantities are related proportionally by a constant positive ratio. The ratio is called the constant of proportionality or simply, the constant. 12.5Notes.notebook January 09, 2014 Example 1: y 50 45 40 35 30 25 20 15 10 5 x 0 1 2 3 4 5 6 7 8 9 10 12.5Notes.notebook January 09, 2014 Example 2: y 30 25 20 15 10 5 x 0 1 2 3 4 5 6 7 8 9 10 12.5Notes.notebook January 09, 2014 Example 3: y 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x 1 2 3 4 5 6 7 8 9 10 12.5Notes.notebook Example 4: Example 5: January 09, 2014 12.5Notes.notebook Example 6: January 09, 2014 12.5Notes.notebook Homework • Practice Worksheets on 12.5 January 09, 2014
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