The direct variation equation between x and y is 4x = y.
Here, we are given that x and y are in direct variation. In other words, this means that x and y are directly proportional to each other. Thus, if k is a constant term, then the relation between x and y can be represented as-
x = ky
Now, we are given that if y = 12, x = 3
⇒ 3 = 12k
12k = 3
k = 3/12
k = 1/4
Thus, we found the value of k, the relation will become-
x = y/4
or 4x = y
Thus, the direct variation equation between x and y is 4x = y.
Learn more about proportionality here-
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