Solve for x and y using cross multiplication method
x + 2y = 3, 3x − 2y + 7 = 0
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Answer: 3x−2y+3=0 ...(1)
4x−3y−47=0 ... (2)
From equation(1):a
1
=3,b
1
=−2 and c
1
=3
From equation (2):a
2
=4,b
2
=3 and c
2
=−47
Using cross multiplication method
94−9
x
=
12+141
y
=
9+8
1
85
x
=
153
y
=
17
1
85
x
=
17
1
⇒x=
17
85
=5
And
153
y
=
17
1
⇒y=
17
153
=9
Answer x=5 and y=9
Thus x=5,y=9
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