Problem:
Find the distance from the point ${\frac{21}{5}, -\frac{21}{5}}$ to the line $\frac{14 x}{5}+\frac{7 y}{5}-\frac{9}{5}=0$.
Answer:
$\frac{102}{35 \sqrt{5}}$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/point_to_plane_distance/2529.txt'}