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M=y2-y1/X2-x1 solve y2

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M = (y₂ - y₁) / (x₂ - x₁)

Multiply each side by (x₂ - x₁): M/(x₂ - x₁) = (y₂ - y₁)

Add y₁ to each side: y₂ = M/(x₂ - x₁) + y₁


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