Math Problem Statement

Which of the following represents all solutions to the system of equations created by the given linear equation and the quadratic equation y = 4x^2 + 2x - 1?

Solution

To solve this problem, we need to determine which set of points satisfy both the linear equation (unfortunately not visible here but likely implied by the points) and the quadratic equation y=4x2+2x1y = 4x^2 + 2x - 1.


Step-by-step solution:

  1. Quadratic equation verification: Substitute each (x,y)(x, y) pair from the options into y=4x2+2x1y = 4x^2 + 2x - 1 to check if the point lies on the parabola.

Option A:

  • Point 1: (0,2)(0, 2) y=4(0)2+2(0)1=12y = 4(0)^2 + 2(0) - 1 = -1 \neq 2 (0,2)(0, 2) does NOT lie on the parabola.

  • Point 2: (12,3)\left(-\frac{1}{2}, 3\right) y=4(12)2+2(12)1=4(14)11=11=03y = 4\left(-\frac{1}{2}\right)^2 + 2\left(-\frac{1}{2}\right) - 1 = 4\left(\frac{1}{4}\right) - 1 - 1 = 1 - 1 = 0 \neq 3 (12,3)\left(-\frac{1}{2}, 3\right) does NOT lie on the parabola.

Option A is eliminated.


Option B:

  • Point 1: (12,1)\left(\frac{1}{2}, 1\right) y=4(12)2+2(12)1=4(14)+11=1+11=1y = 4\left(\frac{1}{2}\right)^2 + 2\left(\frac{1}{2}\right) - 1 = 4\left(\frac{1}{4}\right) + 1 - 1 = 1 + 1 - 1 = 1 (12,1)\left(\frac{1}{2}, 1\right) lies on the parabola.

  • Point 2: (1,4)(-1, 4) y=4(1)2+2(1)1=4(1)21=43=14y = 4(-1)^2 + 2(-1) - 1 = 4(1) - 2 - 1 = 4 - 3 = 1 \neq 4 (1,4)(-1, 4) does NOT lie on the parabola.

Option B is eliminated.


Option C:

  • Point 1: (12,3)\left(-\frac{1}{2}, 3\right) y=4(12)2+2(12)1=4(14)11=11=03y = 4\left(-\frac{1}{2}\right)^2 + 2\left(-\frac{1}{2}\right) - 1 = 4\left(\frac{1}{4}\right) - 1 - 1 = 1 - 1 = 0 \neq 3 (12,3)\left(-\frac{1}{2}, 3\right) does NOT lie on the parabola.

  • Point 2: (32,5)\left(-\frac{3}{2}, 5\right) y=4(32)2+2(32)1=4(94)31=931=5y = 4\left(-\frac{3}{2}\right)^2 + 2\left(-\frac{3}{2}\right) - 1 = 4\left(\frac{9}{4}\right) - 3 - 1 = 9 - 3 - 1 = 5 (32,5)\left(-\frac{3}{2}, 5\right) lies on the parabola.

Option C is eliminated.


Option D:

  • Point 1: (12,1)\left(\frac{1}{2}, 1\right) y=4(12)2+2(12)1=4(14)+11=1y = 4\left(\frac{1}{2}\right)^2 + 2\left(\frac{1}{2}\right) - 1 = 4\left(\frac{1}{4}\right) + 1 - 1 = 1 (12,1)\left(\frac{1}{2}, 1\right) lies on the parabola.

  • Point 2: (32,5)\left(-\frac{3}{2}, 5\right) y=4(32)2+2(32)1=4(94)31=931=5y = 4\left(-\frac{3}{2}\right)^2 + 2\left(-\frac{3}{2}\right) - 1 = 4\left(\frac{9}{4}\right) - 3 - 1 = 9 - 3 - 1 = 5 (32,5)\left(-\frac{3}{2}, 5\right) lies on the parabola.

Option D is correct.


Final Answer:

D. (12,1)\left(\frac{1}{2}, 1\right) and (32,5)\left(-\frac{3}{2}, 5\right)


Would you like a detailed explanation of verifying solutions or the derivation process? Here are some related questions to expand your understanding:

  1. How do you find solutions to a system involving a linear and a quadratic equation?
  2. What methods can be used to solve systems of nonlinear equations graphically?
  3. How does substitution simplify solving these systems algebraically?
  4. Can a system involving a quadratic and a linear equation have more than two solutions?
  5. Why do some points fail to satisfy one of the equations in a system?

Tip: Always substitute each point into both equations when solving a system of equations!

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Equations
Quadratic Equations

Formulas

y = 4x^2 + 2x - 1

Theorems

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Suitable Grade Level

Grades 9-12