Proportional Relationships Notes
Proportional Relationships Notes
How to tell if a relationship is proportional
O When graphed, a line is formed
O The graph starts at origin (0,0)
O You must multiply x by some number to get y (y=kx)
O y/x is the same for all data points of the problem
Example
Proportional Relationship – All medium pizzas $6
|# of Pizzas |Process |Cost |
|(x) | |(y) |
|1 |1(6) |6 |
|2 |2(6) |12 |
|3 |3(6) |18 |
|4 |4(6) |24 |
Non Proportional Relationship – First 2 medium pizzas $6, all additional pizzas $4
|# of Pizzas |Process |Cost |
|(x) | |(y) |
|1 |1(6) |6 |
|2 |2(6) |12 |
|3 |2(6) + 1(4) |16 |
|4 |2(6)+2(4) |20 |
-----------------------
6/1 = 6
18/3 = 6
Equation y=6x
IS PROPORTIONAL
6/1 = 6
16/3 = 5.66666666
20/4 = 5
IS NOT PROPORTIONAL
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