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parallel lines

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by goyalsau » Sat Oct 02, 2010 2:06 pm
Which of the following lines is parallel to line x=1.44-3y?

a)y=x/6+25

b) x/3-y=2

c) y+x/3=10

d) y=0.48-x/3

e) x/4+3y=1
Saurabh Goyal
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by shovan85 » Sat Oct 02, 2010 2:10 pm
IMO C

D is the same line to what we have been asked to check parallel with
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by goyalsau » Sat Oct 02, 2010 2:35 pm
shovan85 wrote:IMO C

D is the same line to what we have been asked to check parallel with
I don't know i am sleeping or doing what?
Not able to figure out such a trick and just keep on blaming the question........

Well thanks for reply.
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by diebeatsthegmat » Sat Oct 02, 2010 7:12 pm
goyalsau wrote:Which of the following lines is parallel to line x=1.44-3y?

a)y=x/6+25

b) x/3-y=2

c) y+x/3=10

d) y=0.48-x/3

e) x/4+3y=1
according to what i know two lines are parallel when their slops are equal
so we have to find the slop of the known line
x=1.44-3y or 3y=1.44-x thus y=-1/3x+1,44
and since we know the slop is -1/3
so only D makes sense
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by goyalsau » Sat Oct 02, 2010 8:14 pm
diebeatsthegmat wrote:
goyalsau wrote:Which of the following lines is parallel to line x=1.44-3y?

a)y=x/6+25

b) x/3-y=2

c) y+x/3=10

d) y=0.48-x/3

e) x/4+3y=1
according to what i know two lines are parallel when their slops are equal
so we have to find the slop of the known line
x=1.44-3y or 3y=1.44-x thus y=-1/3x+1,44
and since we know the slop is -1/3
so only D makes sense
You are doing the same mistake that i did when i solving it first.

x=1.44-3y -------------- (1)
Now it can be written as

3y = 1.44 - x
y = - x/3 + 1.44/3
y = -x/3 + .48------------ Changed form of the equation that is given in the question
Slope of this question is -1/3


Now option C

y+x/3=10 --------- ( 2 )
y = - x/3 + 10

Slope of this question is -1/3


Now take option D

y=0.48-x/3
slope of this line is -1/3 but the value of C is and this C is y = mx+c ( c = .48 )
Now c is same the value in option D then it can't be parallel , it will just over lap the first line.
So the Correct option should Be C.
Saurabh Goyal
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