Trigonometry Examples

$\frac{x^{2}}{4} - \frac{y^{2}}{81} = 1$

Step 1

Simplify each term in the equation in order to set the right side equal to $1$ . The standard form of an ellipse or hyperbola requires the right side of the equation be $1$ .

$\frac{x^{2}}{4} - \frac{y^{2}}{81} = 1$

Step 2

This is the form of a hyperbola. Use this form to determine the values used to find the asymptotes of the hyperbola.

$\frac{{(x - h)}^{2}}{a^{2}} - \frac{{(y - k)}^{2}}{b^{2}} = 1$

Step 3

Match the values in this hyperbola to those of the standard form. The variable $h$ represents the x-offset from the origin, $k$ represents the y-offset from origin, $a$ .

$a = 2$

$b = 9$

$k = 0$

$h = 0$

Step 4

The asymptotes follow the form $y = \pm \frac{b (x - h)}{a} + k$ because this hyperbola opens left and right.

$y = \pm \frac{9}{2} x + 0$

Step 5

Simplify $\frac{9}{2} x + 0$ .

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Step 5.1

Add $\frac{9}{2} x$ and $0$ .

$y = \frac{9}{2} x$

Step 5.2

Combine $\frac{9}{2}$ and $x$ .

$y = \frac{9 x}{2}$

Step 6

Simplify $- \frac{9}{2} x + 0$ .

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Step 6.1

Add $- \frac{9}{2} x$ and $0$ .

$y = - \frac{9}{2} x$

Step 6.2

Combine $x$ and $\frac{9}{2}$ .

$y = - \frac{x \cdot 9}{2}$

Step 6.3

Move $9$ to the left of $x$ .

$y = - \frac{9 x}{2}$

Step 7

This hyperbola has two asymptotes.

$y = \frac{9 x}{2}, y = - \frac{9 x}{2}$

Step 8

The asymptotes are $y = \frac{9 x}{2}$ and $y = - \frac{9 x}{2}$ .

Asymptotes: $y = \frac{9 x}{2}, y = - \frac{9 x}{2}$

Step 9