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x
²
+
y
²
-
1
0
x
+
1
2
y
+
5
7
=
0
,
x
²
+
y
²
-
1
0
x
-
4
y
+
2
5
=
0
,
x
2
+
y
2
-
2
x
+
4
y
+
3
=
0
,
x
2
+
y
2
-
2
x
+
4
y
-
3
1
=
0
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