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the x+0 rule can be used to describe it

X+0 should be your available method

Y is directly proportional to x. If y=30 and x=6, find the value of k (the constant.) Divide both y and x by x. Then you shall get the value of k, which is, in this case, 5. SO the answer is A: She could divide and y-value by its corresponding x-value.