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Mathematics
Mathematics
Problem
If
(
1
,
2
)
(1, 2)
(
1
,
2
)
is a limiting point of the co-axial system of circles containing the circle
x
2
+
y
2
+
x
−
5
y
+
9
=
0
x^2 + y^2 + x - 5y + 9 = 0
x
2
+
y
2
+
x
−
5
y
+
9
=
0
, then the equation of the radical axis is a.
x
−
9
y
+
4
=
0
x - 9y + 4 = 0
x
−
9
y
+
4
=
0
b.
3
x
−
y
+
4
=
0
3x - y + 4 = 0
3
x
−
y
+
4
=
0
c.
x
+
3
y
−
4
=
0
x + 3y - 4 = 0
x
+
3
y
−
4
=
0
d.
9
x
+
y
−
4
=
0
9x + y - 4 = 0
9
x
+
y
−
4
=
0
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