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


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Ex 3.1, 9 Which of the given values of x and y make the following pair of matrices equal [■8(3x+7&5@y+1&2−3x)] = [■8(0&y−2@8&4)] (A) x = (−1)/3, y = 7 (B) Not possible to find (C) y = 7, x = (−2)/3 (D) x = (−1)/3, y = (−2)/3 Since matrices are equal. Their corresponding elements are equal 3x + 7 = 0 y – 2 = 5 y + 1 = 8 2 – 3x = 4 Solving these equations Solving (1) 3x + 7 = 0 3x = – 7 x = ("–" 𝟕)/𝟑 Solving (4) 2 – 3x = 4 2 – 4 = 3x –2 = 3x x = (−𝟐)/𝟑 x cannot have two values So, we cannot find value of x Similarly, we cannot find the value of y So, value of x & y is impossible to find. Hence, Correct answer is B

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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.