Class 12th

The given system of eqⁿ can be written in matrix form as

       AK = B

The given system of eqⁿ in matrix form is AK = B

The given system of eqⁿ in matrix form is AK = B.

Then, |A| = 5 x 3 - 7 x 2 = 15 - 14 = 1 ≠ 0

∴ The system has a unique solution.

∴ k = 2 and y = -3

The given system of eqⁿ in matrix form is AK = B

= 5 x 28 -13 + 4 x (-9)

= 140 - 13 - 76

= 51 ≠ 0 .

The given system of eqⁿ are consistent

The given system of eqⁿ using matrix form can be written as AK = B

$=3\left(0-5\right)+1\left(0+3\right)-2\left(0-6\right)$

= -15 + 3 + 12

 = -15 + 15

= 0

This is a Multiple Choice Questions as classified in NCERT Exemplar

Answer-b

Explanation- from the figure we can say that diode D1 is reverse biased and diode D2 is forward biased so current will flow from B to A.

The given system of eqⁿ using matrix method can be expressed as

                 AK = B

$=\left(6a-2a\right)-\left(4a-2a\right)+\left(2a-3a\right)$

= 4a – 2a – a

= a ≠ 0.

Hence, the given system of eqⁿ is consistent

This is a Multiple Choice Questions as classified in NCERT Exemplar

Explanation - When p-n junction is forward biased, it opposes the potential barrier junction, when p-n junction is reverse biased, it supports the potential barrier junction, resulting increase in potential barrier across the junction.

The given system of equation can be written in the form AK = B

Hence the given system of eqⁿ are inconsistent.

The given system of eqⁿ can be written in the form AK = B where

Now, = 2 – (-1) = 2 + 1 = 3 ≠ 0.

∴ The system of eqⁿis consistent.