Graphing Hyperbolas

A hyperbola consists of two curves that are symmetrical. To graph the hyperbola, we will plot the two vertices and asymptotes. The asymptotes guide in where to draw the hyperbola.

Graphing hyperbolas img 1


Remember the two patterns for hyperbolas:

Graphing hyperbolas img 2

To graph a hyperbola....

1. Determine if it is horizontal or vertical. Find the center point, a, and b.
2. Graph the center point.
3. Use the a value to find the two vertices.
4. Use the b value to draw the guiding box and asymptotes.
5. Draw the hyperbola.

Examples:

Graphing hyperbolas img 3

First, we know this is horizontal since the x is positive. That means the hyperbola will open to the left and right. The center point is (2, -1). a = 2, b = 3

The center is (2, -1). Let's plot that point:

Graphing hyperbolas img 4

Next we will use our a value to find our two vertices. a = 2. Since the hyperbola is horizontal, we must count 2 spaces to the left and right of our center point. That will be the location of our vertices.

Graphing hyperbolas img 5

Next, we'll use the b value to draw in a guiding box. b = 3, so we will count up 3 and down 3 from both vertices. This will give us the 4 corners of our guiding box.

Graphing hyperbolas img 6

We can now draw our 2 asymptotes diagonally through the corners of the box:

Graphing hyperbolas img 7

Finally, we draw in our hyperbola. Each half starts at the vertex and continues towards the asymptotes but never actually reaches them.

Graphing hyperbolas img 8

The center point, guiding box, and asymptotes are not technically part of the answer, so a clean version of the graph would look like this:

Graphing hyperbolas img 9

Graphing hyperbolas img 10

First, we know this is vertical since the y is positive. That means the hyperbola will open up and down. The center point is (-2, -3). a = 3, b = 1

The center is (-2, -3). Let's plot that point:

Graphing hyperbolas img 11

Next we will use our a value to find our two vertices. a = 3. Since the hyperbola is vertical, we must count 3 spaces up and down from our center point. That will be the location of our vertices.

Graphing hyperbolas img 12

Next, we'll use the b value to draw in a guiding box. b = 1, so we will count left 1 and right 1 from both vertices. This will give us the 4 corners of our guiding box.

Graphing hyperbolas img 13

We can now draw our 2 asymptotes diagonally through the corners of the box:

Graphing hyperbolas img 14

Finally, we draw in our hyperbola. Each half starts at the vertex and continues towards the asymptotes but never actually reaches them.

Graphing hyperbolas img 15

Practice: Graph each hyperbola.

Graphing hyperbolas img 16

Graphing hyperbolas img 17

Graphing hyperbolas img 18

Graphing hyperbolas img 19

Graphing hyperbolas img 20



Answers:

Graphing hyperbolas img 21Graphing hyperbolas img 22

Graphing hyperbolas img 23Graphing hyperbolas img 24

Graphing hyperbolas img 25



Related Links:
Math
Fractions
Factors


Educational Videos