D. Determine the equation of a vertical line that passes through each given point. \( \begin{array}{ll}\text { 1. }(-2,1) x=-2 & \text { 2. }(3,15) x=3 \\ \text { 3. }(9,-7) x=9 & \text { 4. }(-11,-8) x=-11 \\ \text { 5. }(-5,-10) x=-5 & \text { 6. }(0,-4) x=0\end{array} \)

To determine the equation of a vertical line that passes through a given point, we use the x-coordinate of that point. The equation of a vertical line is of the form \( x = a \), where \( a \) is the x-coordinate of the point. Here are the equations for the vertical lines that pass through each of the given points: 1. For the point \((-2, 1)\), the equation is \( x = -2 \). 2. For the point \((3, 15)\), the equation is \( x = 3 \). 3. For the point \((9, -7)\), the equation is \( x = 9 \). 4. For the point \((-11, -8)\), the equation is \( x = -11 \). 5. For the point \((-5, -10)\), the equation is \( x = -5 \). 6. For the point \((0, -4)\), the equation is \( x = 0 \). So, the equations of the vertical lines are: 1. \( x = -2 \) 2. \( x = 3 \) 3. \( x = 9 \) 4. \( x = -11 \) 5. \( x = -5 \) 6. \( x = 0 \)