Math Problem Statement

Solve the system of equations: x + y = 2 and y = x^2 - 4x + 4.

Solution

The image shows a system of two equations:

1.x+y=21. \quad x + y = 2 2.y=x24x+42. \quad y = x^2 - 4x + 4

To solve this system, we can use substitution. Since yy is already expressed in terms of xx in the second equation, we can substitute this expression for yy into the first equation:

Step-by-step solution:

  1. From the first equation: x+y=2x + y = 2 Substitute y=x24x+4y = x^2 - 4x + 4: x+(x24x+4)=2x + (x^2 - 4x + 4) = 2

  2. Simplify the equation: x23x+4=2x^2 - 3x + 4 = 2

  3. Move all terms to one side: x23x+42=0x^2 - 3x + 4 - 2 = 0 x23x+2=0x^2 - 3x + 2 = 0

  4. Solve this quadratic equation using the quadratic formula: x=(3)±(3)24(1)(2)2(1)x = \frac{-(-3) \pm \sqrt{(-3)^2 - 4(1)(2)}}{2(1)} x=3±982x = \frac{3 \pm \sqrt{9 - 8}}{2} x=3±12x = \frac{3 \pm \sqrt{1}}{2} x=3±12x = \frac{3 \pm 1}{2}

  5. This gives two solutions for xx: x=3+12=2orx=312=1x = \frac{3 + 1}{2} = 2 \quad \text{or} \quad x = \frac{3 - 1}{2} = 1

  6. Now substitute these values of xx back into the equation y=x24x+4y = x^2 - 4x + 4 to find yy.

    • When x=2x = 2: y=224(2)+4=48+4=0y = 2^2 - 4(2) + 4 = 4 - 8 + 4 = 0

    • When x=1x = 1: y=124(1)+4=14+4=1y = 1^2 - 4(1) + 4 = 1 - 4 + 4 = 1

Final solution:

  • (x,y)=(2,0)(x, y) = (2, 0)
  • (x,y)=(1,1)(x, y) = (1, 1)

Would you like more details on this solution, or have any questions?

Here are 5 related questions you could explore:

  1. How do we solve quadratic equations using the quadratic formula?
  2. Can we solve the system graphically and verify the solutions?
  3. How would the solution change if the second equation were different?
  4. What happens if the quadratic discriminant is negative?
  5. Can we use another method, like elimination, to solve this system?

Tip: Always simplify your equations as much as possible before solving. It reduces errors and makes solving faster.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Substitution Method

Formulas

Quadratic equation formula: ax^2 + bx + c = 0
Substitution method for solving systems of equations

Theorems

Quadratic formula: x = (-b ± √(b^2 - 4ac)) / 2a

Suitable Grade Level

Grades 8-10