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Aplicamos esta fórmula :
(y₂ - y₁)
y - y₁ = -------------- (x - x₁)
(x₂ - x₁)
- 5 - 4
y - 4 = ----------- (x - 2)
4 - 2
- 9
y - 4 = --------- (x - 2)
2
2y - 8 = - 9x + 18
2y = - 9x + 18 + 8
2y = - 9x + 26
y = (- 9x + 26)/2
La ecuación es :
y = (- 9x + 26)/2