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उस रेखा का कार्तीय समीकरणे ज्ञात कीजिए जो बिन्दु (-2, 4,-5) से जाती है और \(\frac{x+3}{3}\) = \(\frac{y-4}{5}\) = \(\frac{z+8}{6}\) के समांतर है|

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माना रेखा बिंदु (x1, y1, z1) से गुजरती है तथा उसके दिक् अनुपात a, b, c हैं तो रेखा का समीकरण

यहाँ पर रेखा (-2, 4, -5) से जाती है और

के समान्तर है। अतः रेखा के दिक् अनुपात 3, 5, 6 है।

∴ रेखा का वांछित समीकरण

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