y = kx where k is a non-zero constant is an equation of direct proportionality between x and y.
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An equation that states that two ratios are equal is a proportion.
the three kinds of proportions are indirect proportion, direct proportion and thepartitive proportion
No, it is not.
There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.
proportion