Page 320 - DECO403_MATHEMATICS_FOR_ECONOMISTS_PUNJABI

VED1
E L-LOVELY-H math23-1 IInd 6-8-11 IIIrd 24-1-12 IVth 21-4-12 Vth 20-8-12 VIth 10-9-12

noEPk;soh dk rfDs

B'N 2 5
−
;fjyzve 2 =− = (24 15) =−
9
3 12
2 3
;fjyzve 3 =+ = 10 9 1
−
=
3 5
2 3
;fjyzve 2 =− = 24 15 =−
−
9
5 12
1 3
=
−
;fjyzve 3 =+ = 12 9 13
3 12
1 2
−
−
;fjyzve 5 =− =− (5 6) = ( 1) =+
1
3 5
2 3
;fjyzve 3 =+ =− (10 9) 1
−
=
3 5
1 3
=
−
;fjyzve 5 =− =− (5 6) 1
2 5
1 2
;fjyzve 12 =+ = (3 4) =−
−
1
2 3
−
11 9 1
Adj. A =− 9 3 1
−
1 1 1
1 2 3 3 5 2 5 2 3
A = 2 3 5 = 1 − 2 + 3
5 12 3 12 3 5
3 5 12
1 (36 25) 2(24 15) 3(10 9)= − − − + −
(1 11) (2 9) (3 1) 11 18 3= × − × + × = − + = − 4
11 9 1
− −
−
11 9 1 4 4 4
9
−
1
A= Adj. A =− 1 − 9 3 1 = − 3 − 1
A 4 4 4 4
−
1 1 1 1 1 1
− −
4 4 4
T[dkjoD 3L w?fNqe; gqDkbh dh ;jkfJs Bkb x, y ns/ z d/ nB[eb w[Zb gsk eo'.
x – 2y + 3z = 1 .....(i)
3x – y + 4z = 3 .....(ii)
2x + y – 2z = –1 .....(iii)

314 LOVELY PROFESSIONAL UNIVERSITY