Math Problem Statement

(x - 7)^2 + (y + 2)^2 = 49 and y = x - 2. Find the solution set by graphing both equations and finding all points of intersection.

Solution

The problem in the image asks to find the solution set of a system of equations by graphing them:

  1. (x7)2+(y+2)2=49(x - 7)^2 + (y + 2)^2 = 49 — This is the equation of a circle.
  2. y=x2y = x - 2 — This is the equation of a line.

Step 1: Analyze the Circle Equation

(x7)2+(y+2)2=49(x - 7)^2 + (y + 2)^2 = 49

  • This is a circle centered at (7,2)(7, -2) with a radius of 49=7\sqrt{49} = 7.

Step 2: Analyze the Line Equation

y=x2y = x - 2

  • This is a straight line with a slope of 1 and a y-intercept of -2.

Step 3: Find the Points of Intersection

To find where the line intersects the circle, substitute y=x2y = x - 2 into the circle’s equation:

(x7)2+(x2+2)2=49(x - 7)^2 + (x - 2 + 2)^2 = 49

This simplifies to:

(x7)2+(x)2=49(x - 7)^2 + (x)^2 = 49

Expand both terms:

(x214x+49)+x2=49(x^2 - 14x + 49) + x^2 = 49

Combine like terms:

2x214x+49=492x^2 - 14x + 49 = 49

Simplify:

2x214x=02x^2 - 14x = 0

Factor out 2x2x:

2x(x7)=02x(x - 7) = 0

Thus, x=0x = 0 or x=7x = 7.

Step 4: Find Corresponding y-values

  • For x=0x = 0: y=02=2y = 0 - 2 = -2.
  • For x=7x = 7: y=72=5y = 7 - 2 = 5.

Solution Set

The points of intersection are (0,2)(0, -2) and (7,5)(7, 5).

Would you like more details or have any further questions?

Here are 5 related questions for further understanding:

  1. How do you graph a circle based on its equation?
  2. What is the geometric meaning of the radius and center of a circle?
  3. How do you find the slope of a line from its equation?
  4. What are the algebraic methods to solve systems involving a circle and a line?
  5. How do you check if a point lies on a circle or line by substituting values?

Tip: For solving systems involving circles and lines, substitution is often a powerful method to reduce the system to one variable!

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Math Problem Analysis

Mathematical Concepts

Algebra
Geometry
Graphing Equations

Formulas

(x - h)^2 + (y - k)^2 = r^2 (Circle Equation)
y = mx + b (Linear Equation)

Theorems

Intersection of Circle and Line
Substitution Method

Suitable Grade Level

Grades 9-12