MauriceLong
Write an equation of the line containing the given point an parallel to the given line.
(7,-6); 7x-9y=4
The equation of the the line is Y=
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edwardp
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7x-9y=4 => slope = 7/9
the equation of the line will be
y=mx+b
-6=(7/9)*7+b
and then solve for b
MauriceLong
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im still confuse with this..
edwardp
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which step?
edwardp
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the line is parallel to the given line, so it has the same slope
MauriceLong
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how would i write the equation for Y=
mark_o.
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hi, first before we get the parallel line equation,:
from this equation
7x-9y=4 what is y=?
MauriceLong
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y= 7/9x-4/9
mark_o.
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ok good with this line y= 7/9x-4/9 what is your slope m=?
mark_o.
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hmm seems like you dont like an interaction question and answer,,... :D
ok after getting the slope of this line y= 7/9x-4/9 , also get the slope of parallel to this
line then form an equation of line from the point (7,-6) with that slope of parallel line..
..
mark_o.
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@ MauriceLong
did you get it ?
MauriceLong
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the slope is 4
MauriceLong
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ok
MauriceLong
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can u help me solve this problem please
mark_o.
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im sorry the slope of parallel line is the same m1=m2 so you can form another line
using this slope m1, using the point(7,-6) and the formula y1-y=m(x-x1)
MauriceLong
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ok. i am getting a better understanding on this so far.
mark_o.
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from
y= mx + b
y= 7/9x - 4/9 what is the slope m?
mark_o.
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yesss just answer what i ask you and you will get it ... :D
mark_o.
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try to compare the formula to the one you answered on y=7/9 x -4/9
MauriceLong
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would i have too subtract 7/9-4/9
mark_o.
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by comparing the formula
from
y= mx + b
y= 7/9x - 4/9 what is the slope m? we know that b=4/9, what is slope m?
mark_o.
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no you cant subtract because 7/9 x has an x with it and the 4/9 has no x.. so they are different terms
MauriceLong
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ok
mark_o.
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if it would be 7/9x - 4/9 x then its ok to subtract but this time they are not.. :D
go ahead you can ask me more question what do you want to know
MauriceLong
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|dw:1354520274544:dw|
MauriceLong
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im having a hard time solving this problem
mark_o.
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ok i will show you the easy way of doing the solution of it,,, :D
MauriceLong
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ok
mark_o.
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we want to know the slope m of this particular line
|dw:1354578182118:dw|
mark_o.
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from
y= mx + b
y= 7/9x + - 4/9 we know that b=-4/9,, what is slope m=?
MauriceLong
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I dont know how too get the slope. Confuse.
MauriceLong
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do i subtract -4/9 too both sides
mark_o.
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i will give you more examples
if y= 3x +4... the slope of this is m=3 and b=4
for f(x)=1/3 -7 the slope of this line is m=1/3 and b=-7
MauriceLong
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so the slope is 4/9
mark_o.
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from
y= mx + b
y= 7/9x + - 4/9
that is b=-4/9,, what is m?
MauriceLong
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m=7/9
mark_o.
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yessss : correct :D
mark_o.
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so now that you know m=7/9,
we also have the point (x1,y1)=(7,-6);
use that given to the formula
y-y1=m(x-x1)
MauriceLong
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y-y1=7/9(x-x1)
mark_o.
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correct but you also have to sub
what is x1 and y1
(x1,y1)=(7,-6); sub thius to what you have done you are getting closer :D
MauriceLong
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7x-6y
mark_o.
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this is what you said the answer y-y1=7/9(x-x1)
all you need to do is to sub what is x1 and y1 there
mark_o.
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(x1,y1)=(7,-6); sub this to your answer y-y1=7/9(x-x1)
mark_o.
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if you have a point of (7,-6) your x1=7 and y1=-6... therefore
this can be like this
(x1,y1)=(7,-6)
mark_o.
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therefore plug those x1 =7 and y1=-6 to your answer y-y1=7/9(x-x1)
MauriceLong
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y=7/9(x-6)
mark_o.
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y - y1 = 7/9 ( x - x1 )
y - ____ = 7/9 (x - ______)
MauriceLong
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y-6=7/9(x-7)
mark_o.
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the point is (7 , -6)
( x1,y1) x1=7 and y1= -6 careful on negative sign, put the negative sign
on 6... you are getting closer to the correct answer
mark_o.
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y - y1 = 7/9 ( x - x1 )
y - ____ = 7/9 (x - ______) give it more try ill tell you if you are correct :D
mark_o.
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your answer
y-6=7/9(x-7)
-6 is not correct because y- -6=__?
mark_o.
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y - y1 = 7/9 ( x - x1 ) ....
y - ____ = 7/9 (x - 7) give it more try on the y, ill tell you if you are correct :D
- - 6 is not= -6
mark_o.
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y - y1 = 7/9 ( x - x1 )
y - -6 = 7/9 (x - 7) try to simplify this more