The variable y *depends* upon the variable x, hence y is the *dependent *variable and x is the *independent* variable. In the relationship, x can vary freely, whereas y can only vary in accordance with the variation in x.

The unit rate is the is the rate of y with...

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The variable y *depends* upon the variable x, hence y is the *dependent *variable and x is the *independent* variable. In the relationship, x can vary freely, whereas y can only vary in accordance with the variation in x.

The unit rate is the is the rate of y with respect to x. If the unit rate is 1/3, then for one unit of x, there is 1/3 of a unit of y.

We write

y = 1/3x

y is said to be *proportional* to x because y increases linearly with x.

**Answer iv) y = 1/3x**