express x as a function of y
Understand the Problem
The question is asking to rearrange an equation so that x is represented as a function of y. This typically involves algebraic manipulation to isolate x on one side of the equation.
Answer
$$ x(y) = \frac{y  3}{2} $$
Answer for screen readers
$$ x(y) = \frac{y  3}{2} $$
Steps to Solve

Identify the equation
Start with the original equation given in the problem. If we have an equation like $y = 2x + 3$, this is where we begin. 
Isolate the term with x
Subtract the constant from both sides of the equation to move it away from the x term. For the example above, subtract 3: $$ y  3 = 2x $$ 
Solve for x
Next, divide both sides of the equation by the coefficient of x to solve for x. In our case, the coefficient is 2: $$ x = \frac{y  3}{2} $$ 
Rewrite as a function
Express x as a function of y. This can be written as: $$ x(y) = \frac{y  3}{2} $$
$$ x(y) = \frac{y  3}{2} $$
More Information
This shows that x is expressed as a function of y. The function allows us to find the value of x for any given value of y.
Tips
 Forgetting to perform the same operation on both sides of the equation, which can lead to incorrect answers. Always make sure to maintain equality.
 Not simplifying the equation correctly, which can result in a more complicated form rather than isolating x.