Finite Math Examples

$x y = 4$

Step 1

Divide each term in $x y = 4$ by $x$ and simplify.

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Step 1.1

Divide each term in $x y = 4$ by $x$ .

$\frac{x y}{x} = \frac{4}{x}$

Step 1.2

Simplify the left side.

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Step 1.2.1

Cancel the common factor of $x$ .

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Step 1.2.1.1

Cancel the common factor.

$\frac{x y}{x} = \frac{4}{x}$

Step 1.2.1.2

Divide $y$ by $1$ .

$y = \frac{4}{x}$

Step 2

Set the denominator in $\frac{4}{x}$ equal to $0$ to find where the expression is undefined.

$x = 0$

Step 3

The domain is all values of $x$ that make the expression defined.

Interval Notation:

$(- \infty, 0) \cup (0, \infty)$

Set-Builder Notation:

${x | x \neq 0}$

Step 4