Question on: JAMB Mathematics - 2011
If | 2 3 | = | 4 1 |. find the value of y. 7
A
-6
B
6
C
-12
D
12
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Correct Option: A
\(\begin{vmatrix} 2 & 3 \ 5 & 3x \end{vmatrix}\) = \(\begin{vmatrix} 4 & 1 \ 3 & 2x \end{vmatrix}\)
(2 x 3x) - (5 x 3) = (4 x 2x) - (3 x 1)
6x - 15 = 8x - 3
6x - 8x = 15 - 3
-2x = 12
x = \(\frac{12}{-2}\)
= -6
(2 x 3x) - (5 x 3) = (4 x 2x) - (3 x 1)
6x - 15 = 8x - 3
6x - 8x = 15 - 3
-2x = 12
x = \(\frac{12}{-2}\)
= -6
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