Sasha noticed that the graph of the sales of yearbooks represented a proportional relationship. How could she have calculated the constant of proportionality by looking at the graph?
She could divide any y-value by its corresponding x-value.
She could divide any x-value by its corresponding y-value.
She could add any y-value to its corresponding x-value.
She could subtract any x-value from its corresponding y-value.

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I summon @UsukiDoll

whoa too risky... T_T.

The first one is correct. I give you my word for it.

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