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月 日( )
● 次の連立方程式の解として正しいものを選びなさい.
[1E1-00]
(1)
2
x
+
4
y
=
4
3
x
+
3
y
=
−6
(A)
(
x
,
y
)
=
(
−6
,
4
)
(B)
(
x
,
y
)
=
(
5
,
2
)
(C)
(
x
,
y
)
=
(
7
,
−2
)
(2)
−
x
−
2
y
=
9
10
x
+
3
y
=
−5
(A)
(
x
,
y
)
=
(
5
,
−7
)
(B)
(
x
,
y
)
=
(
4
,
−7
)
(C)
(
x
,
y
)
=
(
1
,
−5
)
(3)
2
x
+
6
y
=
4
4
x
+
7
y
=
−7
(A)
(
x
,
y
)
=
(
−7
,
3
)
(B)
(
x
,
y
)
=
(
−7
,
−8
)
(C)
(
x
,
y
)
=
(
−8
,
−7
)
(4)
5
x
+
2
y
=
2
−8
x
−
2
y
=
4
(A)
(
x
,
y
)
=
(
−2
,
6
)
(B)
(
x
,
y
)
=
(
−3
,
−8
)
(C)
(
x
,
y
)
=
(
−5
,
−3
)
(1)
A
(2)
C
(3)
A
(4)
A