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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

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


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

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.