Lin needs to mix a specific shade of orange paint for the set of the school play. The color uses 3 parts yellow for every 2 parts red. Complete the table to show different combinations of red and yellow paint that will make the shade of orange Lin needs.
Cups of red paint (r)
cups of yellow paint (y)
total cups of paint (t)
2
3

6

20

18

14

16

50

42

Lin notices that the number of cups of red paint is always 25 of the total number of cups. She writes the equation r=25t to describe the relationship. Which is the independent variable? Which is the dependent variable? Explain how you know.

Write an equation that describes the relationship between r and y where y is the independent variable.
Write an equation that describes the relationship between y and r where is r the independent variable.