Example

Example: Graphing (y+2)29(x+1)24=1\frac{(y+2)^2}{9} - \frac{(x+1)^2}{4} = 1

To graph the equation (y+2)29(x+1)24=1\frac{(y+2)^2}{9} - \frac{(x+1)^2}{4} = 1, apply the procedure for graphing a hyperbola. Since the (y+2)2(y+2)^2-term is positive, the hyperbola opens up and down. Find the center (h,k)(h, k) by identifying that the center is (1,2)(-1, -2). Next, identify the constants aa and bb, which are a=3a = 3 and b=2b = 2. Sketch the central rectangle that passes through the points 33 units above and below the center, and 22 units to the left and right of the center. Draw the asymptotes by sketching the lines through the diagonals of the rectangle. Finally, mark the vertices and graph the branches, making sure they open up and down.

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Updated 2026-05-26

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