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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)
4
x
−
4
y
=
0
−7
x
+
5
y
=
−4
(A)
(
x
,
y
)
=
(
9
,
−8
)
(B)
(
x
,
y
)
=
(
10
,
−2
)
(C)
(
x
,
y
)
=
(
2
,
2
)
(2)
3
x
−
6
y
=
−6
−2
x
+
8
y
=
−12
(A)
(
x
,
y
)
=
(
−10
,
−1
)
(B)
(
x
,
y
)
=
(
5
,
−5
)
(C)
(
x
,
y
)
=
(
−10
,
−4
)
(3)
6
x
+
6
y
=
18
−4
x
−
8
y
=
0
(A)
(
x
,
y
)
=
(
6
,
−3
)
(B)
(
x
,
y
)
=
(
9
,
7
)
(C)
(
x
,
y
)
=
(
−10
,
8
)
(4)
4
x
+
9
y
=
−17
−
x
+
2
y
=
0
(A)
(
x
,
y
)
=
(
9
,
1
)
(B)
(
x
,
y
)
=
(
−8
,
2
)
(C)
(
x
,
y
)
=
(
−2
,
−1
)
(1)
C
(2)
C
(3)
A
(4)
C