जर 6x - 5y + 11 = 0 आणि 15x + ky - 9 = 0 ह्या समीकरणांचे कोणतेही उकल नसतील तर k चे मूल्य शोधा.

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RRB ALP Previous Paper 17 (Held On: 21 Aug 2018 Shift 3)
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  1. -12.5
  2. 12.5
  3. -18
  4. 18

Answer (Detailed Solution Below)

Option 1 : -12.5
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वापरलेली संकल्पना:

x आणि y या दोन चलांमधील रेखीय समीकरणांच्या जोडीचा विचार करा.

a1x + b1y + c1 = 0

a2x + b2y + c2 = 0

येथे  a1, b1, c1, a2, b2, cया सर्व वास्तविक संख्या आहेत.

लक्षात ठेवा, a12 + b12 ≠ 0, a22 + b22 ≠ 0

जर (a1/a2) = (b1/b2) ≠ (c1/c2), तर कोणतेही समाधान होणार नाही.

गणना:

जेव्हा दोन समीकरणांना कोणतेही समाधान नसते तेव्हा समांतर समीकरण प्रणाली वापरून,

मग,

 6/15 = -5/k

⇒ k = -25/2

⇒ k = -12.5
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