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Mathematics
Mathematics
Problem
If
P
P
P
is a point on the circle
x
2
+
y
2
=
9
x^2 + y^2 = 9
x
2
+
y
2
=
9
,
Q
Q
Q
is a point on the line
7
x
+
y
+
3
=
0
7x + y + 3 = 0
7
x
+
y
+
3
=
0
, and the line
x
−
y
+
1
=
0
x - y + 1 = 0
x
−
y
+
1
=
0
, is the perpendicular bisector of
P
Q
PQ
P
Q
, then the coordinates of
P
P
P
are a.
(
3
,
0
)
(3, 0)
(
3
,
0
)
b.
(
72
25
,
−
21
25
)
\left(\frac{72}{25}, -\frac{21}{25}\right)
(
25
72
,
−
25
21
)
c.
(
0
,
3
)
(0, 3)
(
0
,
3
)
d.
(
−
72
25
,
21
25
)
\left(-\frac{72}{25}, \frac{21}{25}\right)
(
−
25
72
,
25
21
)
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