Answer: The line is
units long.
Explanation:
You can find the distance using the Pythagorean theorem.
The line travels 8 units across and 1 down. These are the "sides" of the triangle, and we can treat the line given as the hypotenuse of the triangle.
![a^2 + b^2 = c^2\\\\1^2 + 8^2 = c^2\\\\1 + 64 = c^2\\\\c = √(65)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3i4ishsmte99txeh0tsdhv6z9h45jzog5a.png)
The line is
units long.