The constant of proportionality shown in the table that shows the cost and the number of books is 3.
What is the constant of proportionality ?
When there is a direct proportional relationship, it means that as the value of one variable increases, the value of the other variable also increases. As the number of books increases, the cost increases.
Direct proportion: y = kx
Where:
- y = dependent variable
- k = constant of proportionality
- x = independent variable
k = y/x
6/2 = 3
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