Math Problem Statement

Find an equation of a hyperbola satisfying the given conditions: Vertices at (3, −7) and (3, 3), asymptotes y = 5x − 17, y = −5x + 13.

Solution

Let's solve the problem.

Given Data:

  1. Vertices: (3,7)(3, -7) and (3,3)(3, 3).
  2. Asymptotes: y=5x17y = 5x - 17 and y=5x+13y = -5x + 13.

Step 1: Determine the type of hyperbola

Since the vertices share the same xx-coordinate (33), the hyperbola is vertical (opens up and down). The general equation for such a hyperbola is: (xh)2b2(yk)2a2=1,\frac{(x - h)^2}{b^2} - \frac{(y - k)^2}{a^2} = -1, where (h,k)(h, k) is the center, aa is the distance from the center to the vertices, and bb is related to the slopes of the asymptotes.

Step 2: Find the center (h,k)(h, k)

The center is the midpoint of the vertices. Calculating the midpoint: h=3+32=3,k=7+32=2.h = \frac{3 + 3}{2} = 3, \quad k = \frac{-7 + 3}{2} = -2. Thus, the center is (3,2)(3, -2).

Step 3: Find a2a^2

The distance between the vertices is 2a2a. The vertices are (3,7)(3, -7) and (3,3)(3, 3), so the distance is: 2a=3(7)=10a=5.2a = 3 - (-7) = 10 \quad \Rightarrow \quad a = 5. Thus, a2=25a^2 = 25.

Step 4: Use the asymptotes to find b2b^2

The equations of the asymptotes are given as: y=5x17andy=5x+13.y = 5x - 17 \quad \text{and} \quad y = -5x + 13. The slopes of these asymptotes are m=±5m = \pm 5. For a vertical hyperbola, the relationship between aa, bb, and the slope of the asymptotes is: slope=abb=aslope.\text{slope} = \frac{a}{b} \quad \Rightarrow \quad b = \frac{a}{\text{slope}}. Substituting a=5a = 5 and slope=5\text{slope} = 5: b=55=1b2=1.b = \frac{5}{5} = 1 \quad \Rightarrow \quad b^2 = 1.

Step 5: Write the equation of the hyperbola

The equation for a vertical hyperbola is: (yk)2a2(xh)2b2=1.\frac{(y - k)^2}{a^2} - \frac{(x - h)^2}{b^2} = 1. Substitute h=3h = 3, k=2k = -2, a2=25a^2 = 25, and b2=1b^2 = 1: (y+2)225(x3)21=1.\frac{(y + 2)^2}{25} - \frac{(x - 3)^2}{1} = 1.

Final Answer:

The equation of the hyperbola is: (y+2)225(x3)2=1.\boxed{\frac{(y + 2)^2}{25} - (x - 3)^2 = 1}.

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Here are 5 related questions to explore:

  1. How do the slopes of the asymptotes help determine the hyperbola's orientation?
  2. What changes in the equation if the hyperbola were horizontal?
  3. Can we find the foci of this hyperbola? How?
  4. What is the importance of b2b^2 in the hyperbola's geometry?
  5. How does shifting the center affect the hyperbola's equation?

Tip: For hyperbolas, always focus on identifying whether the major axis is vertical or horizontal based on the vertices.

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Math Problem Analysis

Mathematical Concepts

Conic Sections
Hyperbolas
Coordinate Geometry

Formulas

Midpoint formula: (x₁ + x₂)/2, (y₁ + y₂)/2
Distance formula between vertices: 2a
Equation of a vertical hyperbola: (y - k)^2/a^2 - (x - h)^2/b^2 = 1
Asymptotes slope relationship for hyperbolas: slope = a/b

Theorems

Properties of Hyperbolas
Equation of Asymptotes for Hyperbolas

Suitable Grade Level

Grades 10-12