Message from Warren H in MacGuyver - Skills & Academics #homework-help


2018-01-29 01:22:32 UTC  

Thanks mate. I still have a week before the finally draft

2018-01-29 01:25:17 UTC  

yw!

2018-01-29 02:52:36 UTC  

Anyone able to help with an algebra problem? Pretty basic

2018-01-29 02:53:17 UTC  

@Warren H shoot

2018-01-29 02:53:32 UTC  

9u = 6/5

2018-01-29 02:53:47 UTC  

https://cdn.discordapp.com/attachments/387060078433271808/407367696531849226/image.jpg

2018-01-29 02:53:49 UTC  

How do i get to 2/15?

2018-01-29 02:54:00 UTC  

Multiply both sides by 5

2018-01-29 02:54:10 UTC  

so on the left you have 45 u

2018-01-29 02:54:43 UTC  

an the right the 5 on the bottom cancels out with the 5 on the top you just multiplied

2018-01-29 02:54:52 UTC  

so 45u = 6

2018-01-29 02:55:03 UTC  

then divide both sides by 45

2018-01-29 02:55:09 UTC  

so u = 6/45

2018-01-29 02:55:24 UTC  

6 is 2\*3, and 45 = 15\*3

2018-01-29 02:55:49 UTC  

so u = (2\*3)/(15\*3)

2018-01-29 02:56:06 UTC  

the 3 on top and bottom cross out

2018-01-29 02:56:11 UTC  

so u = 2/15

2018-01-29 02:57:08 UTC  

@Warren H oh you want it the way they did it in the picture? it is similar:

2018-01-29 02:57:17 UTC  

starting from 9u = 6/5

2018-01-29 02:57:29 UTC  

Your way seems easier. There's was confusing as heck

2018-01-29 02:57:54 UTC  

How did you know 15 x 3? Instead of 9x5?

2018-01-29 02:58:03 UTC  

I'm bad with fractions lol

2018-01-29 02:58:32 UTC  

I'll do it closer to the way they did it:
starting from 9u = 6/5
divide both sides by 9, so u = (6/5) * (1/9)

2018-01-29 02:58:42 UTC  

so u = 6/(5*9)

2018-01-29 02:58:59 UTC  

now 6 is 2\*3 and 9 is 3\*3

2018-01-29 02:59:12 UTC  

so u = (2\*3)/(5\*3\*3)

2018-01-29 02:59:29 UTC  

cross out a 3 on top and bottom

2018-01-29 02:59:39 UTC  

Ohh okay.

2018-01-29 02:59:40 UTC  

so u = 2/(5*3)

2018-01-29 02:59:44 UTC  

so u = 2/15

2018-01-29 02:59:52 UTC  

yep

2018-01-29 03:00:58 UTC  

So I do that every time? Divide both sides by whatever the number is?

2018-01-29 03:01:46 UTC  

Yep that will always work

2018-01-29 03:03:49 UTC  

Awesome thanks. One more, this one is a negative number. I'm guessing it works the same?

2018-01-29 03:03:56 UTC  

-4w = 6/7

2018-01-29 03:04:42 UTC  

So divide both sides by -4 and I get 6/7 * 1/4? Or -1/4

2018-01-29 03:06:23 UTC  

Yep:
divide both sides by -4, so w = 6/(7* -4)
6 is 2\*3 and -4 is 2\*-2
so w = (2\*3) / (7\*2\*-2)
then cross out the two on top and bottom
so w = 3/(7*-2)
so w = 3/(-14) or equivalently w = -3/14

2018-01-29 03:06:48 UTC  

@Warren H the second one

2018-01-29 03:07:16 UTC  

the negative sign stays with the number it is attached to

2018-01-29 03:10:14 UTC  

Okay. So I got 3/7 the first time. But it's actually negative 3/14ths? Or -3 over 14?

2018-01-29 03:11:53 UTC  

Yep. If you're asking if there is a difference between " negative 3/14ths vs -3 over 14" the answer is no, they have the same value