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P₁ (X₁, Y₁) P₂ (X₂, Y₂)

P₁ P₂ = √[(x₂ - x₁)² ­+ (y₂ - y₁)²]

y = mx + b

Donde:

m = pendiente

b = ordenada del origen

Sustituyendo:

P₁ = (2, 4)

P₂ = (6, 8)

P₁P₂ = √[(6 – 2)² + (8 – 4)²]

P₁P₂ = √32 = 5.65