theoallen
Badges: 3
Rep:
?
#1
Report Thread starter 4 years ago
#1
Okay I have this question, but I am getting the wrong answer, where am I going wrong?

1 1/4 (4-2x) = 5/14 (6x+1)

So first I make it look nicer

5 (4-2x) / 4 = 5 (6x+1) / 14

Then I cross multiply

70(4-2x) = 20(6x+1)

Then multiply out he brackets

280-140x = 120x + 20

And then rearrange

140x-120x = 280+20 = 300, but that's not the answer, what have I done wrong?
0
reply
username1854431
Badges: 16
Rep:
?
#2
Report 4 years ago
#2
(Original post by theoallen)
Okay I have this question, but I am getting the wrong answer, where am I going wrong?

1 1/4 (4-2x) = 5/14 (6x+1)

So first I make it look nicer

5 (4-2x) / 4 = 20 (not 5) (6x+1) / 14

Then I cross multiply

70(4-2x) = 20(6x+1)

Then multiply out he brackets

280-140x = 120x + 20

And then rearrange

140x-120x = 280+20 = 300, but that's not the answer, what have I done wrong?
You didn't multiply the right hand side by 5
0
reply
natninja
Badges: 21
Rep:
?
#3
Report 4 years ago
#3
(Original post by theoallen)
Okay I have this question, but I am getting the wrong answer, where am I going wrong?

1 1/4 (4-2x) = 5/14 (6x+1)

So first I make it look nicer

5 (4-2x) / 4 = 5 (6x+1) / 14

Then I cross multiply

70(4-2x) = 20(6x+1)

Then multiply out he brackets

280-140x = 120x + 20

And then rearrange

140x-120x = 280+20 = 300, but that's not the answer, what have I done wrong?
Is x=1 the answer by any chance?

You seem to have done your final rearranging wrong.
0
reply
Zacken
Badges: 22
Rep:
?
#4
Report 4 years ago
#4
(Original post by theoallen)

280-140x = 120x + 20

And then rearrange

140x-120x = 280+20 = 300, but that's not the answer, what have I done wrong?
That's almost right. You should use more steps:

280 - 140x = 120x + 20

Move the 140x over (it becomes a +)

280 = 140x + 120x + 20

Move the 20 over (it becomes a -)

280 - 20 = 140x + 120x

Simplify and solve.
0
reply
natninja
Badges: 21
Rep:
?
#5
Report 4 years ago
#5
(Original post by Axel Johann)
You didn't multiply the right hand side by 5
He didn't multiply the left hand side by 5 either then... he just converted from 1\frac{1}{4} \mathrm{ to } \frac{5}{4}
0
reply
Zacken
Badges: 22
Rep:
?
#6
Report 4 years ago
#6
(Original post by Axel Johann)
You didn't multiply the right hand side by 5
Check again. You seem to have misunderstood.

(Original post by natninja)
Is x=1 the answer by any chance?
Yep.
0
reply
username1854431
Badges: 16
Rep:
?
#7
Report 4 years ago
#7
(Original post by natninja)
He didn't multiply the left hand side by 5 either then... he just converted from 1\frac{1}{4} \mathrm{ to } \frac{5}{4}
(Original post by Zacken)
Check again. You seem to have misunderstood.



Yep.
Ohh i didnt see taht 1 haha :lol:

whoops
0
reply
theoallen
Badges: 3
Rep:
?
#8
Report Thread starter 4 years ago
#8
(Original post by Axel Johann)
You didn't multiply the right hand side by 5
Am I meant too? Why would I multiply it by 5?
0
reply
username1854431
Badges: 16
Rep:
?
#9
Report 4 years ago
#9
(Original post by theoallen)
Am I meant too? Why would I multiply it by 5?
Nah don't worry, i was wrong.
0
reply
Zacken
Badges: 22
Rep:
?
#10
Report 4 years ago
#10
(Original post by theoallen)
Am I meant too? Why would I multiply it by 5?
Look at the other posts on the thread.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (47)
18.01%
I have experienced some financial difficulties (73)
27.97%
I haven't experienced any financial difficulties and things have stayed the same (100)
38.31%
I have had better financial opportunities as a result of the pandemic (32)
12.26%
I've had another experience (let us know in the thread!) (9)
3.45%

Watched Threads

View All