CBSE Class 12 Sample Paper for 2020 Boards

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Class 12
Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Question 13 - CBSE Class 12 Sample Paper for 2020 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at April 16, 2024 by

If [1 2 2 1]  [x  y] = [5 4] , then value of y is _______

If [1 2 2 1]  [x  y] = [5 4] , then value of y is __ - Sample Paper

Question 13 - CBSE Class 12 Sample Paper for 2020 Boards - Part 2

Transcript

Question 13 If [■8(1&2@2&1)][■8(𝑥@𝑦)] = [■8(5@4)], then value of y is _______ [■8(1&2@2&1)][■8(𝑥@𝑦)] = [■8(5@4)] [■8(1×𝑥+2×𝑦@2×𝑥+1×𝑦)] = [■8(5@4)] [■8(𝑥+2𝑦@2𝑥+𝑦)] = [■8(5@4)] Therefore, x + 2y = 5 2x + y = 4 Now solving (1) and (2), Doing (2) – 2 × (1) (2x + y) – 2 × (x + 2y) = 4 – 2 × 5 2x + y – 2x – 4y = 4 – 10 y – 4y = –6 –3y = –6 y = (−6)/(−3) y = 2 So, value of y is 2

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.