समीकरण 2x + y = 5; x - 3y = -1 और 3x + 4y = k के निकाय संगत हैं, तो k बराबर है :

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HTET TGT Mathematics 2017 Official Paper
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  2. 2
  3. 5
  4. 10

Answer (Detailed Solution Below)

Option 4 : 10
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HTET PGT Official Computer Science Paper - 2019
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दिया गया है:​ 

2x + y = 5; x - 3y = -1 और 3x + 4y = k संगत है

प्रयुक्त संकल्पना

यदि निकाय संगत है तो A की रैंक (आव्यूह गुणांक) = संवर्धित आव्यूह (A: B) की रैंक = n (चरों की संख्या)

गणना:

⇒ R = 2R2 - R1

⇒ R= 2R3 - 3R1

⇒  R= 7R3 + 5R2

14k - 140 = 0  A और A:B की रैंक के लिए = चरों की संख्या अर्थात 2 

∴ k = 10 

अत: सही विकल्प 4 है।

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