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RedRicin
A direct proportion is any equation where y = mx+b. (i.e., a linear equation)

Each side of 3y = 1/2x can be divided by 3 to get y = 1/6x, satisfying the condition of y = mx+b. (b=0)

In this case, the constant of proportionality would be 1/6.
iGreen
Yes, there is.

Just divide 3 to both sides:

y = (1/2 / 3)x

Find the reciprocal of 3 and multiply:

y = (1/2 * 1/3)x

Multiply the numerators and denominators together:

y = 1/6x

So the constant of proportionality is 1/6.

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