Find the distance from point $a$ to $\overleftrightarrow{xz}$. Round your answer to the nearest tenth. The triangle a x z is plotted on coordinate plane. The x-axis ranges from negative 4 to 6, in increments of 1. The y-axis ranges from negative 3 to 8, in increments of 1. A straight line passes through point x and point z. Point x is at ordered pair negative 1 comma negative 2, point y is at ordered pair 0 comma 1, point z is at ordered pair 2 comma 7, and point a is at ordered pair 3 comma 0. Angle a y x is marked as a right angle.