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Question
why can you not say that two vertical lines have equal slope? why can you not say that the product of the slopes of a vertical and horizontal line is - 1? a. every vertical line passes through the origin. this means that the slope between two points cannot be calculated for a vertical line. because of this, the slopes of vertical lines cannot be multiplied. b. vertical lines have undefined slope. the product of an undefined quantity and any number is still undefined and cannot be equal to - 1. c. vertical lines have infinite slope. the product of an infinite quantity and any number is infinite and cannot be equal to - 1. d. horizontal lines have undefined slope. the product of an undefined quantity and any number is still undefined and cannot be equal to - 1.
La pendiente de una línea vertical es indefinida ya que la fórmula de la pendiente $m=\frac{y_2 - y_1}{x_2 - x_1}$ da una división entre cero para una línea vertical (donde $x_2=x_1$). La pendiente de una línea horizontal es 0. No se puede calcular el producto de una cantidad indefinida (pendiente de línea vertical) y un número (0, pendiente de línea horizontal) para obtener - 1. Además, dos cantidades indefinidas (pendientes de dos líneas verticales) no pueden ser comparadas en términos de igualdad.
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C. Líneas verticales tienen pendiente indefinida. El producto de una cantidad indefinida y cualquier número sigue siendo indefinido y no puede ser igual a - 1.