JAMB Mathematics 2021 Objective — Question 25

Question 25 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

25. Given that (2 -3; -1 4)(x;y) = (-1;8), estimate 3x - 2y. (a) 6 (b) 4 (c) 2 (d) 3

A. 6Correct
B. 4
C. 2
D. 3

Explanation

From the matrix equation: 2x-3y=-1 and -x+4y=8. Solving simultaneously gives y=3, x=4. So 3x - 2y = 3(4) - 2(3) = 12 - 6 = 6.

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