Q. 7
If
=
then
A. z=3, w=4
B. z=4, w=3
C. z=1, w=2
D. z=2, w=-1
Answer :
A
By comparing L.H.S and R.H.S
x - y = -1 -------- i
2x – y = 0 -------- ii
2x+ z = 5 --------- iii
3z + w =13 ------- iv
Using i in equation ii
x = -1 + y
ii becomes, -2 + 2y –y = 0
y = 2
x = 1
Putting x in iii
2 + z =5
z = 3
Putting z in iv
9 + w = 13
w = 4
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