(x₁, y₁) and (x₂, y₂). All fields must be numeric.m = (y₂ − y₁) / (x₂ − x₁). If x₂ = x₁, slope is undefined (vertical line).100 × m. Not applicable for vertical lines.θ = arctan(m) in degrees (90° for vertical; 0° for horizontal).y = m x + b, where b = y₁ − m x₁.x = c (no slope form), where c = x₁.Choose which optional categories you allow. Necessary cookies are always on. Privacy Policy.