JEE MATHEMATICS MCQ: MATRICES

1 Easy

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Analyzing +4 | -1

For the system of linear equations

x - 2y = 1,\,\,\,\,x - y + kz = - 2,\,\,\,\,ky + 4z = 6,\,\,\,\,k \in R,

Consider the following statements
A) The system has unique solution, if

k \ne 2,\,\,\,\,k \ne - 2

B) The system has unique solution, if

k = - 2

.
C) The system has unique solution, if

k = 2

.
D) The system has no solution, if

k = 2

.
E) The system has infinite number of solutions, if

k \ne - 2.

Which of the following statements are correct?

View answer and explanation

Correct option: D

(A) and (D)

Option D ((A) and (D)) is correct because the system has a unique solution when

k \ne 2

and

k \ne -2

, and it has no solution when

k = 2

More Questions from MATRICES

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\left|\begin{array}{ccc}a & b-c & b+c \\ c+a & b & c-a \\ a-b & a+b & c\end{array}\right|=0

a, b, c

a x+b y+c=0

{x_2} - {x_3} = 1,\; - {x_1} + 2{x_3} = - 2,\;{x_1} - 2,\;{x_1} - 2{x_2} = 3

2x + 3y + 1 = 0,3x + y - 2 = 0

ax + 2y - b = 0

\left|\begin{array}{ccc}1 & \left(\alpha^{2 x}-\alpha^{-2 x}\right)^2 & \left(\alpha^{2 x}+\alpha^{-2 x}\right)^2 \\ 1 & \left(\beta^{2 x}-\beta^{-2 x}\right)^2 & \left(\beta^{2 x}+\beta^{-2 x}\right)^2 \\ 1 & \left(\gamma^{2 x}-\gamma^{-2 x}\right)^2 & \left(\gamma^{2 x}+\gamma^{-2 x}\right)^2\end{array}\right|

\omega

\left| {\begin{array}{cccccccccccccccccccc} 1&\omega &{{\omega ^2}}\\ \omega &{{\omega ^2}}&1\\ {{\omega ^2}}&1&\omega \end{array}} \right|

A

2 \times 2

A(\operatorname{adj} A)=\left[\begin{array}{cc}10 & 0 \\ 0 & 10\end{array}\right]

|A|