Solve the linear-quadratic system by either evaluating the equations with the answer choices or using Geogebra graphing:

y=x2−x−6


y=x+2


(1 point)
Responses

(-2, 3)
(-2, 3)

(2, 4)
(2, 4)

(−2, 0) and (4, 6)
(−2, 0) and (4, 6)

(0, -2) and (6, 4)

1 answer

To solve the system of equations given by the linear equation \(y = x + 2\) and the quadratic equation \(y = x^2 - x - 6\), we can set them equal to each other since they both equal \(y\):

\[ x + 2 = x^2 - x - 6 \]

Now, we can rearrange this equation to form a standard quadratic equation:

\[ x^2 - x - 6 - x - 2 = 0 \] \[ x^2 - 2x - 8 = 0 \]

Next, we can factor the quadratic:

\[ (x - 4)(x + 2) = 0 \]

This gives us two solutions for \(x\):

\[ x - 4 = 0 \implies x = 4 \] \[ x + 2 = 0 \implies x = -2 \]

Now, we can find the corresponding \(y\) values using the linear equation \(y = x + 2\):

  1. For \(x = 4\): \[ y = 4 + 2 = 6 \] So one solution is \((4, 6)\).

  2. For \(x = -2\): \[ y = -2 + 2 = 0 \] So the other solution is \((-2, 0)\).

Thus, the solutions to the system are:

\[ (-2, 0) \quad \text{and} \quad (4, 6) \]

Among the options given, the correct response is:

(−2, 0) and (4, 6).