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For the system [2−3−46][xy]=[5−10]\begin{bmatrix} 2 & -3 \\ -4 & 6 \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} 5 \\ -10 \end{bmatrix} which of the following statements are correct?

(A) The system has no solution.

(B) The system is consistent.

(C) It has infinitely many solutions.

(D) It has a unique solution.

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 4

The system can be written as:

[2−3−46][xy]=[5−10]\begin{bmatrix} 2 & -3 \\ -4 & 6 \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} 5 \\ -10 \end{bmatrix}

This gives two equations:

2x−3y=52x - 3y = 5 ... (1)

−4x+6y=−10-4x + 6y = -10 ... (2)


Multiply equation (1) by −2-2:

−2(2x−3y)=−2(5)-2(2x - 3y) = -2(5)

−4x+6y=−10-4x + 6y = -10

This is identical to equation (2). Both equations represent the same line.


The determinant of the coefficient matrix:

Det=(2)(6)−(−3)(−4)\text{Det} = (2)(6) - (-3)(-4)

=12−12= 12 - 12

=0= 0

When the determinant is zero, the system either has no solution or infinitely many solutions.


Since both equations are identical (not contradictory), every point on the line 2x−3y=52x - 3y = 5 is a solution.

Therefore:

(A) The system has no solution - False

(B) The system is consistent - True (has at least one solution)

(C) It has infinitely many solutions - True

(D) It has a unique solution - False


The correct statements are (B) and (C) only.

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