Math Problem Statement

(x - 4)^2 + (y - 3)^2 = 98 and -2x + y = 2

Solution

The equations provided are:

  1. (x4)2+(y3)2=98(x - 4)^2 + (y - 3)^2 = 98
  2. 2x+y=2-2x + y = 2

Step 1: Identify the Equations' Forms

  1. The first equation represents a circle with center (4,3)(4, 3) and radius 98\sqrt{98}.
  2. The second equation is a linear equation that we can solve for yy in terms of xx.

Step 2: Solve for yy in Terms of xx

From the second equation: y=2+2xy = 2 + 2x

Step 3: Substitute yy in the Circle Equation

Now, substitute y=2+2xy = 2 + 2x into the circle equation: (x4)2+((2+2x)3)2=98(x - 4)^2 + ((2 + 2x) - 3)^2 = 98 Simplify (2+2x3)(2 + 2x - 3) to obtain: (x4)2+(2x1)2=98(x - 4)^2 + (2x - 1)^2 = 98

Step 4: Expand and Solve the Equation

  1. Expand (x4)2(x - 4)^2 and (2x1)2(2x - 1)^2: (x4)2=x28x+16(x - 4)^2 = x^2 - 8x + 16 (2x1)2=4x24x+1(2x - 1)^2 = 4x^2 - 4x + 1

  2. Substitute these expansions back into the equation: x28x+16+4x24x+1=98x^2 - 8x + 16 + 4x^2 - 4x + 1 = 98

  3. Combine like terms: 5x212x+17=985x^2 - 12x + 17 = 98

  4. Move all terms to one side to set the equation to zero: 5x212x81=05x^2 - 12x - 81 = 0

Step 5: Solve the Quadratic Equation

Now we solve 5x212x81=05x^2 - 12x - 81 = 0 using the quadratic formula: x=(12)±(12)245(81)25x = \frac{-(-12) \pm \sqrt{(-12)^2 - 4 \cdot 5 \cdot (-81)}}{2 \cdot 5} x=12±144+162010x = \frac{12 \pm \sqrt{144 + 1620}}{10} x=12±176410x = \frac{12 \pm \sqrt{1764}}{10} x=12±4210x = \frac{12 \pm 42}{10}

This gives us two solutions for xx:

  1. x=5410=5.4x = \frac{54}{10} = 5.4
  2. x=3010=3x = \frac{-30}{10} = -3

Step 6: Find Corresponding yy Values

For x=5.4x = 5.4: y=2+2(5.4)=2+10.8=12.8y = 2 + 2(5.4) = 2 + 10.8 = 12.8

For x=3x = -3: y=2+2(3)=26=4y = 2 + 2(-3) = 2 - 6 = -4

Solution

The points of intersection are:

  1. (5.4,12.8)(5.4, 12.8)
  2. (3,4)(-3, -4)

Would you like further details on any of these steps?

Here are some related questions you might be interested in:

  1. How can we determine the intersection points graphically?
  2. What other methods can be used to solve the intersection of a circle and a line?
  3. Can we verify the points of intersection using substitution in the original equations?
  4. How do we determine if a line is tangent to a circle?
  5. What does it mean if there are no real solutions in the quadratic step?

Tip: When dealing with circles and lines, translating one equation to express one variable in terms of another and substituting can simplify finding intersections.

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Math Problem Analysis

Mathematical Concepts

Analytic Geometry
Intersection of a Circle and a Line
Quadratic Equations

Formulas

Circle equation: (x - h)^2 + (y - k)^2 = r^2
Linear equation: y = mx + b
Quadratic formula: x = (-b ± √(b^2 - 4ac)) / 2a

Theorems

Quadratic formula
Pythagorean Theorem (for circle definition)

Suitable Grade Level

Grades 10-12