Math Problem Statement

the line 3x = 4x-15 intersects the curve 8x^2 - 27y^2 = 45 at point a and b find a and b

Solution

We are given two equations:

  1. A line equation:
    3x=4x153x = 4x - 15

  2. A hyperbola equation:
    8x227y2=458x^2 - 27y^2 = 45

Step 1: Simplify the line equation.

Rearrange the line equation 3x=4x153x = 4x - 15:

3x4x=153x - 4x = -15

x=15-x = -15

x=15x = 15

Step 2: Substitute x=15x = 15 into the hyperbola equation.

Now that we know x=15x = 15, substitute it into the hyperbola equation 8x227y2=458x^2 - 27y^2 = 45:

8(152)27y2=458(15^2) - 27y^2 = 45

Calculate 152=22515^2 = 225:

8(225)27y2=458(225) - 27y^2 = 45

180027y2=451800 - 27y^2 = 45

Step 3: Solve for y2y^2.

Rearrange the equation to isolate y2y^2:

180045=27y21800 - 45 = 27y^2

1755=27y21755 = 27y^2

y2=175527=65y^2 = \frac{1755}{27} = 65

Thus,

y=±65y = \pm \sqrt{65}

Step 4: Find points A and B.

Since we have x=15x = 15 and y=±65y = \pm \sqrt{65}, the points of intersection AA and BB are:

A(15,65)andB(15,65)A(15, \sqrt{65}) \quad \text{and} \quad B(15, -\sqrt{65})

Final Answer:

The points of intersection are A(15,65)A(15, \sqrt{65}) and B(15,65)B(15, -\sqrt{65}).


Would you like more details or have any questions?

Here are 5 related questions to extend your learning:

  1. How would the solution change if the hyperbola equation was different?
  2. What if the line equation had a different slope?
  3. Can you find the distance between points A and B?
  4. How would you graph the intersection of a line and a hyperbola?
  5. What are the general methods to find intersections between conic sections and lines?

Tip: When solving systems of equations involving a line and a curve, always try to substitute one variable into the other equation after simplifying the line equation.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Conic Sections
Hyperbolas
Intersection of a Line and a Curve

Formulas

Linear equation: y = mx + c
Hyperbola equation: Ax^2 - By^2 = C

Theorems

Substitution method for solving systems of equations

Suitable Grade Level

Grades 10-12