Write as a Function of x x=3y

$x = 3 y$

Rewrite the equation as $3 y = x$ .

$3 y = x$

Divide each term in $3 y = x$ by $3$ and simplify.

Divide each term in $3 y = x$ by $3$ .

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

Simplify the left side.

Cancel the common factor of $3$ .

Cancel the common factor.

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

Divide $y$ by $1$ .

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

To rewrite as a function of $x$ , write the equation so that $y$ is by itself on one side of the equal sign and an expression involving only $x$ is on the other side.

$f (x) = \frac{x}{3}$

Write as a Function of x x=3y

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