An air show is scheduled for an airport located on a coordinate system measured in miles. The air traffic controllers have closed the airspace, modeled by a quadratic equation, to non-air show traffic. The boundary of the closed airspace starts at the vertex at [tex]\((10,6)\)[/tex] and passes through the point [tex]\((12,7)\)[/tex]. A commuter jet has filed a flight plan that takes it along a linear path from [tex]\((-18,14)\)[/tex] to [tex]\((16,-13)\)[/tex]. Which system of equations can be used to determine whether the commuter jet's flight path intersects the closed airspace?

A. [tex]\(\left\{\begin{array}{l}y=\frac{1}{4}(x-5)^2+10 \\ y=-\frac{1}{2} x+5\end{array}\right.\)[/tex]

B. [tex]\(\left\{\begin{array}{l}y=\frac{1}{4}(x-5)^2+10 \\ y=-2 x-22\end{array}\right.\)[/tex]

C. [tex]\(\left\{\begin{array}{l}y-\frac{1}{4}(x-10)^2+8 \\ y=-\frac{27}{34} x-\frac{5}{17}\end{array}\right.\)[/tex]



Answer :

To solve this problem, we need to derive two equations: one for the quadratic boundary of the closed airspace and another for the linear path of the commuter jet. Follow these steps:

### Step 1: Find the Quadratic Equation
The quadratic boundary of the closed airspace has its vertex at [tex]\((10, 6)\)[/tex] and passes through the point [tex]\((12, 7)\)[/tex]. The general form of a quadratic equation with a vertex [tex]\((h, k)\)[/tex] is:
[tex]\[ y = a(x - h)^2 + k \][/tex]
Here, [tex]\( (h, k) = (10, 6) \)[/tex].

Substitute the vertex into the equation:
[tex]\[ y = a(x - 10)^2 + 6 \][/tex]

To find the value of [tex]\(a\)[/tex], use the point [tex]\((12, 7)\)[/tex]:
[tex]\[ 7 = a(12 - 10)^2 + 6 \][/tex]

Simplify:
[tex]\[ 7 = a(2)^2 + 6 \][/tex]
[tex]\[ 7 = 4a + 6 \][/tex]
[tex]\[ 1 = 4a \][/tex]
[tex]\[ a = \frac{1}{4} \][/tex]

Thus, the equation of the quadratic boundary is:
[tex]\[ y = \frac{1}{4}(x - 10)^2 + 6 \][/tex]

### Step 2: Find the Linear Equation
The linear path of the commuter jet goes from [tex]\((-18, 14)\)[/tex] to [tex]\((16, -13)\)[/tex]. Use the slope formula:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
Here, [tex]\((x_1, y_1) = (-18, 14)\)[/tex] and [tex]\((x_2, y_2) = (16, -13)\)[/tex].

Calculate the slope [tex]\(m\)[/tex]:
[tex]\[ m = \frac{-13 - 14}{16 - (-18)} \][/tex]
[tex]\[ m = \frac{-27}{16 + 18} \][/tex]
[tex]\[ m = \frac{-27}{34} \][/tex]

Using the point-slope form [tex]\(y - y_1 = m(x - x_1)\)[/tex] with the point [tex]\((-18, 14)\)[/tex], the equation is:
[tex]\[ y - 14 = \frac{-27}{34}(x - (-18)) \][/tex]
[tex]\[ y - 14 = \frac{-27}{34}(x + 18) \][/tex]

Simplify:
[tex]\[ y = \frac{-27}{34}x + \frac{-27}{34} \cdot 18 + 14 \][/tex]
[tex]\[ y = \frac{-27}{34}x - \frac{486}{34} + 14 \][/tex]
[tex]\[ y = \frac{-27}{34}x - \frac{243}{17} + 14 \][/tex]
[tex]\[ y = \frac{-27}{34}x - 14.2941176470588235 \][/tex]

### Step 3: Form the System of Equations
The system of equations that represents the boundary of the closed airspace and the path of the commuter jet is:
[tex]\[ \left\{ \begin{array}{l} y = \frac{1}{4}(x - 10)^2 + 6 \\ y = \frac{-27}{34}x - \frac{5}{17} \end{array} \right. \][/tex]

None of the given options perfectly match the derived equations. Thus, the correct system of equations based on the given points should be:
[tex]\[ \left\{ \begin{array}{l} y = \frac{1}{4}(x - 10)^2 + 6 \\ y = \frac{-27}{34} x - \frac{5}{17} \end{array} \right. \][/tex]

It's important to match the form exactly to the correct problem parameters.