Mathematics · essential
Line through two given points: direction ratios for JEE
Direction ratios and direction cosines and the angle between two intersecting lines
Formula
\((a,b,c)=(x_2-x_1,\ y_2-y_1,\ z_2-z_1)\)
Variables: Line passes through \(P(x_1,y_1,z_1)\) and \(Q(x_2,y_2,z_2)\).
Conditions: \(P\neq Q\).
Writing equation of a line through two points; checking collinearity.