Final answer:
The equation that represents a proportional relationship is D) y = 6x/7.
Step-by-step explanation:
A proportional relationship is represented by an equation of the form y = kx, where k is the proportionality constant.
Out of the given options, the equation that represents a proportional relationship is D) y = 6x/7. In this equation, the value of y is directly proportional to x, with a proportionality constant of 6/7.
For example, if x = 7, then y = 6.