Answer:
The equation y = 4x represents a linear relationship. It is a linear equation because it can be written in the form y = mx + b, where m is the slope and b is the y-intercept. In this case, the slope is 4, which means that for every unit increase in x, y increases by 4.
However, the equation y = 4x is not proportional. Two quantities are proportional if they maintain a constant ratio. In this equation, the ratio of y to x is not constant because the coefficient of x (4) is not equal to 1. In a proportional relationship, the coefficient would be 1.