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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)
6
x
+
y
=
12
x
−
y
=
−5
(A)
(
x
,
y
)
=
(
−2
,
−9
)
(B)
(
x
,
y
)
=
(
1
,
6
)
(C)
(
x
,
y
)
=
(
9
,
−4
)
(2)
8
x
+
2
y
=
12
−
x
+
3
y
=
31
(A)
(
x
,
y
)
=
(
−1
,
10
)
(B)
(
x
,
y
)
=
(
−9
,
−4
)
(C)
(
x
,
y
)
=
(
7
,
7
)
(3)
6
x
+
7
y
=
−2
8
x
+
10
y
=
0
(A)
(
x
,
y
)
=
(
−5
,
4
)
(B)
(
x
,
y
)
=
(
−3
,
1
)
(C)
(
x
,
y
)
=
(
−4
,
−6
)
(4)
−8
x
−
4
y
=
4
8
x
+
2
y
=
10
(A)
(
x
,
y
)
=
(
−7
,
−4
)
(B)
(
x
,
y
)
=
(
7
,
−1
)
(C)
(
x
,
y
)
=
(
3
,
−7
)
(1)
B
(2)
A
(3)
A
(4)
C