Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
tutors
pricing
login
X
ASK
Home
>>
JEEMAIN and NEET
>>
Mathematics
>>
Class11
>>
Coordinate Geometry
If one of the lines given by $6x^2-xy+4cy^2=0$ is $3x+4y=0$ then c equals
$\begin{array}{1 1}(A)\;-3\\(B)\;-1\\(C)\;3\\(D)\;1 \end{array}$
jeemain
math
class11
coordinate-geometry-straight-lines
equations-of-a-line
ch10
medium
Share
asked
Apr 8, 2014
by
meena.p
retagged
Sep 26, 2014
by
sharmaaparna1
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1 Answer
$3x+4y=0$
is one of the lines of the pair.
$6x^2-xy+4cy^2=0$
Put $y=-\large\frac{-3}{4}$$x$
We get $6x^2+\large\frac{3}{4}$$x^2+4c\bigg(\large\frac{-3}{4}$$x^2 \bigg)=0$
=> $6+\large\frac{3}{4} +\frac{9c}{4}$$=0$
$c=-3$
Hence A is the correct answer.
answered
Apr 8, 2014
by
meena.p
Please
log in
or
register
to add a comment.
Related questions
If the pair of straight lines $x^2-2pxy-y^2=0$ and $x^2-2qxy-y^2=0$ be such that each pair bisects the angle between the other pair then,
jeemain
math
class11
coordinate-geometry-straight-lines
equations-of-a-line
ch10
medium
asked
Apr 8, 2014
by
meena.p
1
answer
The pair of lines represented by $3ax^2+5xy+(a^2-2)y^2=0$ are perpendicular to each other for
jeemain
math
class11
coordinate-geometry-straight-lines
equations-of-a-line
ch10
medium
asked
Apr 8, 2014
by
meena.p
1
answer
Given the points $A(0,4)$ and $B(0,-4)$ the equation of the locus of the point $P(x,y)$ such that $|AP-BP|=6$ is
jeemain
math
class11
coordinate-geometry-straight-lines
equations-of-a-line
ch10
medium
asked
Apr 8, 2014
by
meena.p
1
answer
Find the equation of straight line which passes through the intersection of the lines $3x-4y+1=0$ and $5x+y-1=0$ and $(2,1)$?
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q36
difficult
asked
Feb 5, 2014
by
sreemathi.v
1
answer
Find the equations of the bisectors of the angles between the straight lines $3x-4y+6=0$ and $12x+5y-3=0$.
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q12
easy
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Find the equation of line parallel to $3x-4y+2=0$ and at a distance 2 from it?
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q19
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Find the equation of line which is parallel to $3x-4y+10=0$.Also find such line through the point (2,2)?
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q10
easy
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Ask Question
Tag:
Math
Phy
Chem
Bio
Other
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
JEEMAIN
350+ TESTS
NEET
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
...
X