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)

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