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