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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)
7
x
+
5
y
=
0
3
x
+
y
=
8
(A)
(
x
,
y
)
=
(
5
,
10
)
(B)
(
x
,
y
)
=
(
3
,
2
)
(C)
(
x
,
y
)
=
(
5
,
−7
)
(2)
−3
x
+
3
y
=
0
9
x
−
10
y
=
9
(A)
(
x
,
y
)
=
(
−9
,
−9
)
(B)
(
x
,
y
)
=
(
−4
,
7
)
(C)
(
x
,
y
)
=
(
3
,
−7
)
(3)
9
x
−
y
=
8
−2
x
−
3
y
=
−34
(A)
(
x
,
y
)
=
(
6
,
4
)
(B)
(
x
,
y
)
=
(
2
,
10
)
(C)
(
x
,
y
)
=
(
−7
,
3
)
(4)
−2
x
+
6
y
=
4
−2
x
+
8
y
=
2
(A)
(
x
,
y
)
=
(
−5
,
4
)
(B)
(
x
,
y
)
=
(
−5
,
−1
)
(C)
(
x
,
y
)
=
(
−9
,
5
)
(1)
C
(2)
A
(3)
B
(4)
B