anonymous
  • anonymous
7th grade math please help! 3 1/2 + w - 5 1/4 = 8 Explain how to solve this equation pls
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@Owlcoffee
Nerdsarecool
  • Nerdsarecool
So to solve it
Nerdsarecool
  • Nerdsarecool
You have to go from right to left

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More answers

Nerdsarecool
  • Nerdsarecool
So
Nerdsarecool
  • Nerdsarecool
31/2 + w
Nerdsarecool
  • Nerdsarecool
Then
anonymous
  • anonymous
wait hold on how did you get 31/2
Nerdsarecool
  • Nerdsarecool
Oops
Nerdsarecool
  • Nerdsarecool
I meant
Nerdsarecool
  • Nerdsarecool
3 1/2
Nerdsarecool
  • Nerdsarecool
Sorry
anonymous
  • anonymous
oh ok
Nerdsarecool
  • Nerdsarecool
Then you do the answer to that minus 5 1/4
Nerdsarecool
  • Nerdsarecool
Equals 8
Nerdsarecool
  • Nerdsarecool
Thats how you solve it
anonymous
  • anonymous
Well um can you try to explain it a bit better?
Nerdsarecool
  • Nerdsarecool
Ok
Nerdsarecool
  • Nerdsarecool
First you do
Nerdsarecool
  • Nerdsarecool
3 1/2 + w
Nerdsarecool
  • Nerdsarecool
Which gives you an answer
Nerdsarecool
  • Nerdsarecool
Then you use that answer
anonymous
  • anonymous
what do you get?
Nerdsarecool
  • Nerdsarecool
I don't know
Nerdsarecool
  • Nerdsarecool
3 1/2w
Nerdsarecool
  • Nerdsarecool
Thats what you get
anonymous
  • anonymous
ok, then what?
Nerdsarecool
  • Nerdsarecool
Then you use that subtract it by 5 1/4
sleepyjess
  • sleepyjess
Okay, first we'll need to subtract \(3 \dfrac12 - 5\dfrac14\) To do that, we'll need to find a common denominator. Do you know how to do that?
Nerdsarecool
  • Nerdsarecool
4
Nerdsarecool
  • Nerdsarecool
4
sleepyjess
  • sleepyjess
Nerds, I'm trying to get the asker to the answer
anonymous
  • anonymous
Eh well it's four...
sleepyjess
  • sleepyjess
Good! So how do we make 2 go to 4?
anonymous
  • anonymous
multiply by 2
anonymous
  • anonymous
.
sleepyjess
  • sleepyjess
Yes! So we have to multiply the top AND bottom by 2, which gives us \(3 \dfrac24 - 5\dfrac14\) Now, what is 3-5? \(\dfrac24 - \dfrac14\)?
anonymous
  • anonymous
-2
sleepyjess
  • sleepyjess
Yes, and \(\dfrac24 - \dfrac14\)?
anonymous
  • anonymous
1/4
sleepyjess
  • sleepyjess
Yes! So now we have \(-2 \dfrac14 +w = 8\). Now, we need to find w, do you know how to do that?
anonymous
  • anonymous
subtract -2 1/4 by 8?
sleepyjess
  • sleepyjess
Close, -2 1/4 is a negative, so we need to add 2 1/4 to both sides :)
anonymous
  • anonymous
oh
sleepyjess
  • sleepyjess
So, 2 1/4 - 2 1/4 cancels out, leaving us with w, the 8 + 2 1/4 =?
anonymous
  • anonymous
72/4 ?
sleepyjess
  • sleepyjess
Not quite, 8 + 2 = 10, 10 + 1/4 = 10 1/4
sleepyjess
  • sleepyjess
So now we have, w = \(10 \dfrac14\)
anonymous
  • anonymous
oh so that's it? the k12 answer thing says 9 3/4 :o
sleepyjess
  • sleepyjess
that's weird...
sleepyjess
  • sleepyjess
@TheSmartOne , did I do something wrong?
pooja195
  • pooja195
Yes you did
sleepyjess
  • sleepyjess
Where?
pooja195
  • pooja195
Turn the fractions into improper fractions first
sleepyjess
  • sleepyjess
7/2 21/4
anonymous
  • anonymous
thats what I did and I got a totally different answer
sleepyjess
  • sleepyjess
14/4 - 21/4 7/4 1 3/4
sleepyjess
  • sleepyjess
Damn.... I'm sorry :(
anonymous
  • anonymous
@sleepyjess We all make mistake :D But how do I get the answer?
pooja195
  • pooja195
Ok 1) Turn them into improper 7/2 21/4 \[\huge~\rm~ \frac{ 7 }{ 2}+w-\frac{ 21 }{ 4 } \]
pooja195
  • pooja195
\[\huge~\rm~\frac{ 7 }{ 2 }-\frac{ 21 }{ 4 }=\frac{ -7 }{ 4 }\]
anonymous
  • anonymous
what happened to the addition sign?
pooja195
  • pooja195
The addition sign is still there however we can take out the w for the moment and we would subtract the 2 fractions
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
I divided -7 and 4 and I got -1 3/4
pooja195
  • pooja195
\[\huge~\rm~\bf~w+\frac{- 7 }{ 4 }+\frac{ 7 }{ 4 }=8+\frac{ 7 }{ 4 }\] can you solve for w you dont divide those leave it as it is
anonymous
  • anonymous
Ok so I got 15/4?? Is that wrong
pooja195
  • pooja195
The 7/4's on the w side cancel out 15/4 is incorrect So you really only need to do : \[\huge~\rm~\bf~8+\frac{ 7 }{ 4}=?\]
anonymous
  • anonymous
Yes I did that and got 15/4
anonymous
  • anonymous
wait I read that wrong
pooja195
  • pooja195
Its alright try again :-)
anonymous
  • anonymous
Can you explain how to do that I keep getting the wrong answer
pooja195
  • pooja195
Ok First we need to find a common denominator
pooja195
  • pooja195
*least common
anonymous
  • anonymous
4 right?
pooja195
  • pooja195
Yes 4 is right \[\huge~\rm~\bf~\frac{ (4)8 }{ (4)1 }+\frac{ 7 }{ 4 }\] \[\huge~\rm~\bf~\frac{ 32 }{ 4 }+\frac{ 7 }{ 4 }\] \[\huge~\rm~\bf~\frac{ 32+7=? }{ 4}\]
anonymous
  • anonymous
39/4
anonymous
  • anonymous
Oh got the answer thank you Pooja
pooja195
  • pooja195
you're welcome ^_^

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