Constant of Proportionality: k=5
Interpretation: The Spanish club earned $5 for washing a car
Practice makes perfect
To find the constant of variation of an equation, we need to remember that it is the rate of change of a direct variation. The general form of a direct variation equation sets the dependent variable y equal to the rate of change multiplied by the independent variable x.
y= kx ⇔ y=change in y/change in x* x
Let's look at the given equation to identify this value.
y= 5x
The constant of variation is k=5. In this situation, this means that the Spanish club earned $5 for washing a car.
