Correct option:
C) y = −0.3x
<h2>Explanation:</h2>A proportional relationship between two variables occurs when their ratios are equivalent. In other words, we can write one variable as the product of a constan value and the other variable, so:
So this is the equation of a line that passes through the origin. By comparing this equation with our options, we see that the only option that meets this requirement is option c)