Warren Pritchard
09/11/2024 · Middle School

Esercizio 12.11 Trovare una retta \( r \) passante per il punto \( P=(1,-1,0) \) e parallela al piano \( \pi: 2 x-y+4=0 \). E unica tale retta? Svolgimento Le rette cercate sono infinite, sono tutte quelle che giacciono nel piano parallelo a \( \pi \) e passante per \( P \), che passano a loro volta per \( P \). Il piano che le contiene è \( \pi^{\prime}: 2 x-y=3 \). Per trovare una retta con quella proprieta, basta intersecare \( \pi^{\prime} \) con un piano passante per \( P \). Ad esempio \( \sigma: z=0 \). Allora si ottiene \( r:\left\{\begin{array}{l}2 x-y=3 \\ z=0 .\end{array}\right. \)

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Esistono infinite rette che passano per il punto \( P = (1, -1, 0) \) e sono parallele al piano \( \pi: 2x - y + 4 = 0 \). Una di queste rette è \( r: \left\{ \begin{array}{l} 2x - y = 3 \\ z = 0 \end{array} \right. \).

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