Question

7th grade math please help!



3 1/2 + w - 5 1/4 = 8

Explain how to solve this equation pls

Answer 1

@Owlcoffee

Answer 2

So to solve it

Answer 3

You have to go from right to left

Answer 4

So

Answer 5

31/2 + w

Answer 6

Then

Answer 7

wait hold on how did you get 31/2

Answer 8

Oops

Answer 9

I meant

Answer 10

3 1/2

Answer 11

Sorry

Answer 12

oh ok

Answer 13

Then you do the answer to that minus 5 1/4

Answer 14

Equals 8

Answer 15

Thats how you solve it

Answer 16

Well um can you try to explain it a bit better?

Answer 17

Ok

Answer 18

First you do

Answer 19

3 1/2 + w

Answer 20

Which gives you an answer

Answer 21

Then you use that answer

Answer 22

what do you get?

Answer 23

I don't know

Answer 24

3 1/2w

Answer 25

Thats what you get

Answer 26

ok, then what?

Answer 27

Then you use that subtract it by 5 1/4

Answer 28

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?

Answer 29

4

Answer 30

4

Answer 31

Nerds, I'm trying to get the asker to the answer

Answer 32

Eh well it's four...

Answer 33

Good! So how do we make 2 go to 4?

Answer 34

multiply by 2

Answer 35

.

Answer 36

Yes! So we have to multiply the top AND bottom by 2, which gives us \(3 \dfrac24 - 5\dfrac14\)

Now, what is 3-5?

\(\dfrac24 - \dfrac14\)?

Answer 37

-2

Answer 38

Yes, and

\(\dfrac24 - \dfrac14\)?

Answer 39

1/4

Answer 40

Yes! So now we have \(-2 \dfrac14 +w = 8\). Now, we need to find w, do you know how to do that?

Answer 41

subtract -2 1/4 by 8?

Answer 42

Close, -2 1/4 is a negative, so we need to add 2 1/4 to both sides :)

Answer 43

oh

Answer 44

So, 2 1/4 - 2 1/4 cancels out, leaving us with w, the 8 + 2 1/4 =?

Answer 45

72/4 ?

Answer 46

Not quite, 8 + 2 = 10, 10 + 1/4 = 10 1/4

Answer 47

So now we have, w = \(10 \dfrac14\)

Answer 48

oh so that's it? the k12 answer thing says 9 3/4 :o

Answer 49

that's weird...

Answer 50

@TheSmartOne , did I do something wrong?

Answer 51

Yes you did

Answer 52

Where?

Answer 53

Turn the fractions into improper fractions first

Answer 54

7/2
21/4

Answer 55

thats what I did and I got a totally different answer

Answer 56

14/4 - 21/4
7/4
1 3/4

Answer 57

Damn.... I'm sorry :(

Answer 58

@sleepyjess We all make mistake :D But how do I get the answer?

Answer 59

Ok
1) Turn them into improper
7/2
21/4
\[\huge~\rm~ \frac{ 7 }{ 2}+w-\frac{ 21 }{ 4 } \]

Answer 60

\[\huge~\rm~\frac{ 7 }{ 2 }-\frac{ 21 }{ 4 }=\frac{ -7 }{ 4 }\]

Answer 61

what happened to the addition sign?

Answer 62

The addition sign is still there however we can take out the w for the moment and we would subtract the 2 fractions

Answer 63

oh ok

Answer 64

I divided -7 and 4 and I got -1 3/4

Answer 65

\[\huge~\rm~\bf~w+\frac{- 7 }{ 4 }+\frac{ 7 }{ 4 }=8+\frac{ 7 }{ 4 }\]
can you solve for w
you dont divide those leave it as it is

Answer 66

Ok so I got 15/4?? Is that wrong

Answer 67

The 7/4's on the w side cancel out
15/4 is incorrect
So you really only need to do :
\[\huge~\rm~\bf~8+\frac{ 7 }{ 4}=?\]

Answer 68

Yes I did that and got 15/4

Answer 69

wait I read that wrong

Answer 70

Its alright try again :-)

Answer 71

Can you explain how to do that I keep getting the wrong answer

Answer 72

Ok
First we need to find a common denominator

Answer 73

*least common

Answer 74

4 right?

Answer 75

Yes 4 is right

\[\huge~\rm~\bf~\frac{ (4)8 }{ (4)1 }+\frac{ 7 }{ 4 }\]
\[\huge~\rm~\bf~\frac{ 32 }{ 4 }+\frac{ 7 }{ 4 }\]
\[\huge~\rm~\bf~\frac{ 32+7=? }{ 4}\]

Answer 76

39/4

Answer 77

Oh got the answer thank you Pooja

Answer 78

you're welcome ^_^