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 Constant of proportionality:  The constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the constant of proportionality

 
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1) We want to determine the length of a 40 yard field in feet. There are 3 feet to a yard. During our conversion what is our constant of proportionality?

 

1)
 

2) How would we write a number sentence for the conversion described above?

 

2)
 

3) Tasha's allowance is $3 for every week she does her chores. What is proportion of the money that she's earned to the number of weeks that she has done chores.

 

3)