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Question 4 - CBSE Class 10 Sample Paper for 2020 Boards - Maths Standard - Solutions of Sample Papers for Class 10 Boards

Last updated at Nov. 1, 2019 by

For which value(s) of p, will the lines represented by the following pair of linear equations be parallel

  3x − y − 5 = 0

  6x −2y − p = 0

(a) all real values except 10  (b) 10  (c) 5/2  (d) 1/2

For which value(s) of p, will the lines represented by the pair of

Question 4 - CBSE Class 10 Sample Paper for 2020 Boards - Maths Standard - Part 2
Question 4 - CBSE Class 10 Sample Paper for 2020 Boards - Maths Standard - Part 3

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Transcript

Question 4 For which value(s) of p, will the lines represented by the following pair of linear equations be parallel 3x − y − 5 = 0 6x − 2y − p = 0 (a) all real values except 10 (b) 10 (c) 5/2 (d) 1/2 Given lines 3x − y − 5 = 0 and 6x − 2y − p = 0 3x − y − 5 = 0 Comparing with a1x + b1y + c1 = 0 a1 = 3, b1 = –1, c1 = –5 6x − 2y − p = 0 Comparing with a2x + b2y + c2 = 0 a2 = 6, b2 = –2, c2 = –p Now, Since lines are parallel 𝑎_1/𝑎_2 = 𝑏_1/𝑏_2 ≠ 𝑐_1/𝑐_2 Comparing 𝑎_1/𝑎_2 = 𝑏_1/𝑏_2 ≠ 𝑐_1/𝑐_2 3/6=(−1)/(−2) ≠ (−5)/(−𝑝) 1/2=1/2 ≠ 5/𝑝 Therefore, 1/2 ≠ 5/𝑝 p ≠ 5 × 2 p ≠ 10 So, correct answer is (a) – all real values except 10

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.