alleryThe slope of the line passing through the points (x₁, y₁) and (x₂, y₂) (where x₁ ≠ x₂) is
A(y₂ − y₁) / (x₂ − x₁)
B(y₂ + y₁) / (x₂ + x₁)
C(x₂ + x₁) / (y₂ − y₁)
D(x₂ − x₁) / (y₂ − y₁)
Answer & Solution
Correct answer: A. (y₂ − y₁) / (x₂ − x₁)
Slope m = (y₂ − y₁)/(x₂ − x₁) = rise/run.
Vertical lines (x₁ = x₂) have undefined slope.
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