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Re: Anyone in ot good with math?

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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:28 AM
I'm having problems with 2 step linear equations

In the problem
7(2y-3)=3(6y+5) which becomes
14y-21=18y+15
And then I don't know what to do anymore
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:28 AM
B1
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:29 AM
B2
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pekka16 is not online. pekka16
Joined: 19 May 2013
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16 Dec 2014 05:29 AM
B3
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yoshiandgoomba2 is not online. yoshiandgoomba2
Joined: 21 Mar 2012
Total Posts: 22644
16 Dec 2014 05:30 AM
i think it's
14y-18y=21+15
-4y=36
y=9?
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:30 AM
B4 please help
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67thave is not online. 67thave
Joined: 14 Jul 2011
Total Posts: 34741
16 Dec 2014 05:30 AM
14y-21=18y+15

subtract 14y on both sides

it becomes -21 = 4y + 15
subtract 15 on both sides

now it's -36 = 4y

So y is equal to -9
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yoshiandgoomba2 is not online. yoshiandgoomba2
Joined: 21 Mar 2012
Total Posts: 22644
16 Dec 2014 05:31 AM
i personally think that it's 9
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:32 AM
@yoshi if it's 9 it becomes
105=177
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TehBloxx4h is not online. TehBloxx4h
Joined: 24 Aug 2013
Total Posts: 5577
16 Dec 2014 05:32 AM
-4y=36, is the answer, if I'm correct?
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OnionRinging is not online. OnionRinging
Joined: 06 Apr 2014
Total Posts: 3836
16 Dec 2014 05:32 AM
14y-21=18y+15
-14y  -14y
-------------
-21=4y+15
-15   -15
----------
-36=4y
-------
   4

y = -9
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TehBloxx4h is not online. TehBloxx4h
Joined: 24 Aug 2013
Total Posts: 5577
16 Dec 2014 05:32 AM
ehm no wait I posted nonsense nvm
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:33 AM
Well since that've says say too
Please tell me how to do it
This a part of my exam
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:33 AM
36 didn't work that was my first answer.
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OnionRinging is not online. OnionRinging
Joined: 06 Apr 2014
Total Posts: 3836
16 Dec 2014 05:34 AM
so take the original equation

7(2y-3)=3(6y+5)

and substitute

7(2(-9)-3) = 3(6(-9)+5)

7(-18-3) = 3(-54 + 5)

7(-21) = 3(-49)

147 = 147
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CrossArmsALT4 is not online. CrossArmsALT4
Joined: 03 Aug 2012
Total Posts: 7889
16 Dec 2014 05:34 AM
14y-21=18y+15

14y=18y+36

4y = -36

y = -9

ez pz

lrn2math
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yoshiandgoomba2 is not online. yoshiandgoomba2
Joined: 21 Mar 2012
Total Posts: 22644
16 Dec 2014 05:37 AM
crap i'm getting confused with my current lesson and linear equations
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:40 AM
Does that always work because what the book says in a sample problem like
5v-4=7v+10
--------------------
5v-4-7v=7v+10-7v
--------------------------
-2v-4=10
--------------
-2v-4+4=10+4
--------------------
V=-7
I don't know how it happened please explain
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JacobDeathshard is not online. JacobDeathshard
Joined: 29 Oct 2011
Total Posts: 15503
16 Dec 2014 05:41 AM
-9

had to crack open the good ol' alg 1 textboox
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jake13jake31 is not online. jake13jake31
Joined: 28 Apr 2012
Total Posts: 7901
16 Dec 2014 05:48 AM
14y-21=18y+15

First, subtract 14y on both sides.

-21=4y+15

Now subtract 15 from both sides

-36=4y

Divide both sides by 4

Y=-9

Respect the science!
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:56 AM
How don you know that you are supposed to use 14y and 15 to subtract that is the big question in my mind.
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:57 AM
Bump
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:58 AM
B6
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 05:58 AM
B7
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pekka16 is not online. pekka16
Joined: 19 May 2013
Total Posts: 2247
16 Dec 2014 06:02 AM
B8
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