## Geometry: Common Core (15th Edition)

Therefore, the equation of the horizontal line that passes through this point is $y = -1$. The equation of the vertical line that passes through this point is $x = 0$.
We are given the point $(0, -1)$. If a horizontal line passes through the given point, then each point on that line would have a y-coordinate of $-1$; therefore, the equation of the horizontal line that passes through this point is $y = -1$. If a vertical line passes through the given point, then each point on that line would have an x-coordinate of $0$; therefore, the equation of the vertical line that passes through this point is $x = 0$.