Math Problem Statement

Solve the linear-quadratic system of equations algebraically. Express your values as radical expressions, if necessary. 1. y = -2x + 6 2. y = x^2 - x + 4

Solution

To solve this system of equations algebraically, we can set the two equations equal to each other and solve for xx. Here are the steps:

Given Equations:

  1. y=2x+6y = -2x + 6
  2. y=x2x+4y = x^2 - x + 4

Since both expressions are equal to yy, we can set them equal to each other: 2x+6=x2x+4-2x + 6 = x^2 - x + 4

Step 1: Rearrange the Equation

Move all terms to one side of the equation to set it equal to zero: 0=x2x+4+2x60 = x^2 - x + 4 + 2x - 6 Simplify: 0=x2+x20 = x^2 + x - 2

Step 2: Solve the Quadratic Equation

Now, we have a quadratic equation: x2+x2=0x^2 + x - 2 = 0 This equation can be solved using the quadratic formula: x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} where a=1a = 1, b=1b = 1, and c=2c = -2.

Plugging in the values: x=1±(1)241(2)21x = \frac{-1 \pm \sqrt{(1)^2 - 4 \cdot 1 \cdot (-2)}}{2 \cdot 1} x=1±1+82x = \frac{-1 \pm \sqrt{1 + 8}}{2} x=1±92x = \frac{-1 \pm \sqrt{9}}{2} x=1±32x = \frac{-1 \pm 3}{2}

So, we have two solutions for xx:

  1. x=1+32=1x = \frac{-1 + 3}{2} = 1
  2. x=132=2x = \frac{-1 - 3}{2} = -2

Step 3: Find Corresponding yy Values

Now, we substitute these xx values back into one of the original equations to find yy.

For x=1x = 1:

y=2(1)+6=2+6=4y = -2(1) + 6 = -2 + 6 = 4 So, one solution is (1,4)(1, 4).

For x=2x = -2:

y=2(2)+6=4+6=10y = -2(-2) + 6 = 4 + 6 = 10 So, another solution is (2,10)(-2, 10).

Final Answer

The solutions to the system are: (1,4)and(2,10)(1, 4) \quad \text{and} \quad (-2, 10)

Would you like more details on any of these steps?

Here are some related questions that could further your understanding:

  1. How do you determine whether a system of equations is linear, quadratic, or both?
  2. Can we use graphing to verify these solutions?
  3. What are some alternative methods to solve a linear-quadratic system?
  4. How does the discriminant help in solving quadratic equations?
  5. What do the solutions represent in terms of the graphs of the equations?

Tip: When solving systems involving quadratics, try to simplify the equation to standard form ax2+bx+c=0ax^2 + bx + c = 0 and check if factoring is possible before using the quadratic formula.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Quadratic Equations
Systems of Equations

Formulas

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

Theorems

Quadratic formula

Suitable Grade Level

Grades 10-12