When do I use m = (y₂−y₁)/(x₂−x₁) in Straight Lines, and what does it mean?
slope from two points.
m = (y₂−y₁)/(x₂−x₁) — slope from two points. Use it when: x₁ ≠ x₂. Always check the condition holds before plugging in numbers.
Key point
m = (y₂−y₁)/(x₂−x₁)
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