A-4b=2 , a+3b=9 elimination method
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a-4b=2.......... (1)
a+3b=9.......... (2)
Subtracting equation (1) from (2) we get,
7b=7
b=7/7
b=1
Substituting the value of b in (1) we get,
a-4(1) =2
a-4=2
a=2+4
a=6
a=13
Answered by
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Answer:
( a,b)=(− 2,2)
Step-by-step explanation:
Given
[1]
XXXX
3
a
+
4
b
=
2
[2]
XXXX
4
a
−
3
b
=
−
14
Multiply [1] by 4 and [2] by 3 to obtain two equations with the same
a
coefficient
[3]
XXXX
12
a
+
16
b
=
8
[4]
XXXX
12
a
−
9
b
=
−
42
Subtract [4] from [3] to clear the
a
term
[5]
XXXX
25b= 50#
Divide both sides by
25
[6]
XXXX
b
=
2
Substitute
b
=
2
into equation [1]
[7]
XXXX
3
a
+
4
(
2
)
=
2
[8]
XXXX
3
a
=
−
6
[9]
XXXX
a
=
−
2
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