Functions where y varies directly with x — direct variation equations — follow a specific format.
y= kx
In this form, k≠0.
By substituting the given values for x and y into the equation, we can determine the constant of variation, k.
Now that we have the constant of variation, we can write the function.
y= 1/4x
With this equation, we can find any value of x or y when we are given the other. In this case, we are looking for x when y=7.
