To find the vertical line of symmetry for the given quadrilateral with vertices (0,0), (−8,0), (0,−6), and (−8,−6), we first analyze the positions of the vertices.
These points form a rectangle since the opposite sides are equal and parallel:
- The vertices (0, 0) and (−8, 0) are on the top side of the rectangle.
- The vertices (0, -6) and (−8, -6) are on the bottom side of the rectangle.
Now, to find the vertical line of symmetry, we need to ascertain the midpoint between the leftmost point (−8, 0) and the rightmost point (0, 0).
The x-coordinates of the leftmost point (−8) and the rightmost point (0) average as follows:
\[ \text{Midpoint} = \frac{-8 + 0}{2} = \frac{-8}{2} = -4 \]
Thus, the vertical line of symmetry is given by the equation:
\[ x = -4 \]
So, the complete answer is:
x = -4.