Which of the following equations has a constant of proportionality equal to 1?

$y = \frac{3}{5} x$

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xy=2

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y=x

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x= 3y

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Solution

The correct option is C
y=x

$y = \frac{3}{5} x$ has a constant of proportionality equal to $\frac{3}{5}$
xy=2 has a constant of proportionality equal to 2.
y=x has a constant of proportionality equal to 1.
x=3y has a constant of proportionality equal to 3.

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