Rectangular coordinate system,

Straight Lines - Slope of a line, Parallel and perpendicular lines,

Representations of a Line, General equations of a line,

Straight-line fit

Rectangular Coordinate System

Equation of parallel and perpedicular lines in general form

Slope of a Line

Representation of a Line-1

Representation of a Line-2

Parallel and Perpendicular Lines

General Equation of line

Straight Line Fit