slove using cross multiplication method (2x/3)+(y/2)=-1, (-x/3)+y=3
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Answer
Correct option is
D
x=1,y=−1
2x−y=3---(1)
4x+y=3---(2)
Using formula for cross multiplication method:
(b
1
c
2
−b
2
c
1
)
x
=
(c
1
a
2
−a
1
c
2
)
y
=
(a
1
b
2
−a
2
b
1
)
−1
So, from equation (1) and (2) we can write the value of a,b and c.
(−1)×3−1×3)
x
=
(3×4−2×3)
y
=
(2×1−4×(−1))
−1
−3−3
x
=
12−6
y
=
2+4
−1
−6
x
=
6
y
=
6
−1
−6
x
=
6
−1
6x=6
x=1
6
y
=
6
−1
6y=−6
y=−1
Therefore, x=1,y=−1
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