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Byju's Answer
Standard IX
Mathematics
Circle
Find whether ...
Question
Find whether line is tangent, secant non-intersecting, line equation ,
y
−
3
x
+
2
circle is equation
x
2
+
y
2
−
6
x
+
5
y
−
3
=
0
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Solution
Line eqn
y
=
3
x
−
2
Circle eqn
x
2
+
y
2
−
6
x
+
5
y
−
3
=
0
⟹
x
2
+
(
3
x
−
2
)
2
−
6
x
+
5
(
3
x
−
2
)
−
3
=
0
⟹
x
2
+
9
x
2
−
12
x
+
4
−
6
x
+
15
x
−
30
−
3
=
0
⟹
10
x
2
−
3
x
−
29
=
0
x
=
3
±
√
9
+
4
∗
29
∗
10
20
x
=
3
±
√
1169
20
As the roots are real and there are two solutios hence the line is a secant to the circle
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Similar questions
Q.
Find equation of circle which is concentric to circle
x
2
+
y
2
−
6
x
+
7
=
0
and touches the line
x
+
y
+
3
=
0
.
Q.
Assertion :The equation of circle having radius
√
10
and a diameter along line
2
x
+
y
=
5
is
x
2
+
y
2
−
6
x
+
2
y
=
0
Reason:
2
x
+
y
=
5
is a tangent to the circle
x
2
+
y
2
−
6
x
+
2
y
=
0.
Q.
The equation of the circle whose centre is on the line
2
x
−
y
−
2
=
0
and passes through the points
(
3
,
−
2
)
and
(
−
2
,
0
)
is
Q.
Find the equation of the tangent lines to the circle
x
2
+
y
2
=
9
which are parallel to the line
2
x
+
y
−
3
=
0
.
Q.
The equation of the circle having centre (1, –2) and passing through the point of intersection of the lines 3x + y = 14 and 3x + 5y = 18 is
(a) x
2
+ y
2
– 2x + 4y – 20 = 0
(b) x
2
+ y
2
– 2x – 4y – 20 = 0
(c) x
2
+ y
2
+ 2x – 4y – 20 = 0
(d) x
2
+ y
2
+ 2x + 4y – 20 = 0
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