Direct Variation Equation for direct variation:. Page 6 Steps: 1.Set up a proportion 2.Cross multiply and solve for variable Since x varies directly as.

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Presentation transcript:

Direct Variation Equation for direct variation:

Page 6 Steps: 1.Set up a proportion 2.Cross multiply and solve for variable Since x varies directly as y, we write x in numerator, y in denominator. Not a bad idea to write a generic ratio.

Page 6

Page 7

Check to make sure that the constant of variation is the same all the way across! Since the constant is the same, it is direct variation!

Page 7 Check to make sure that the constant of variation is the same all the way across! Since the constant is not the same, it is not a direct variation!

Page 8

Since the population is growing at a constant rate, I can just multiply the number of years from 2007 by 250. There will be 750 additional people in 2010!

Homework – YAY!!!!! Page 6 #4,6,7,8 Pages 7-8 #1,3,6,11,12,15