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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)
3
x
+
5
y
=
−1
−6
x
−
9
y
=
3
(A)
(
x
,
y
)
=
(
−10
,
2
)
(B)
(
x
,
y
)
=
(
10
,
9
)
(C)
(
x
,
y
)
=
(
−2
,
1
)
(2)
−8
x
−
y
=
0
10
x
+
5
y
=
−30
(A)
(
x
,
y
)
=
(
−2
,
−2
)
(B)
(
x
,
y
)
=
(
1
,
−8
)
(C)
(
x
,
y
)
=
(
6
,
4
)
(3)
−
x
+
y
=
13
3
x
+
7
y
=
1
(A)
(
x
,
y
)
=
(
8
,
8
)
(B)
(
x
,
y
)
=
(
−9
,
4
)
(C)
(
x
,
y
)
=
(
6
,
6
)
(4)
7
x
+
3
y
=
−10
−7
x
+
10
y
=
−3
(A)
(
x
,
y
)
=
(
−7
,
−1
)
(B)
(
x
,
y
)
=
(
−4
,
7
)
(C)
(
x
,
y
)
=
(
−1
,
−1
)
(1)
C
(2)
B
(3)
B
(4)
C