El ángulo que forma la recta l1, cuya pendiente es -1/3 con la recta l2, es de 135°. Calcular la pendiente de la recta l2.
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m1 = -1/3
m2 = ?
tan(135) = -1
-1(1 - (1/3)m2) = m2 + 1/3
-1 + (1/3)m2 = m2 + 1/3
-1 - 1/3 = m2 - (1/3)m2
-4/3 = 2/3m2
m2 = (-4/3)/(2/3) = -2
m2 = -2
La pendiente de I2 = -2