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December 20, 2014

December 20, 2014

Posted by **Abby** on Tuesday, May 14, 2013 at 8:13pm.

- 7th grade math -
**Ms. Sue**, Tuesday, May 14, 2013 at 8:16pmI don't know what's in your head!!

What is the problem?

- 7th grade math -
**Abby**, Tuesday, May 14, 2013 at 8:28pmThanks Ms.Sue!!

My teacher gave me an example (I don't know so sorry)

28+38+34=100

h+p+c=50

h+(28-h)+(34-h)=50

-h+62=50

62/-50=50/-50

12 = h

Thanks (it's really confusing)

- 7th grade math -
**Ms. Sue**, Tuesday, May 14, 2013 at 8:34pmPlease post a problem that you did in your head, and I'll try to help you.

- 7th grade math -
**Abby**, Tuesday, May 14, 2013 at 8:45pm(Blank) horses + (blank) pigs =22

(Blank) horses + (blank) cows =9

(Blank) pigs + (blank) cows =17

Hope that gives you an idea of what I am talking 'bout (if I could take a pic. I would)

Sorry I meant 22

- 7th grade math -
**Reiny**, Tuesday, May 14, 2013 at 10:37pmAre you working with variables?

let the number of horses be x

let the number of pigs be y

let the number of cows be z

so you have:

x+y = 22 #1

x+z = 9 #2

y+z = 17 #3

subtract #1 - #2 ----> y-z = 13 #4

add #3+#4 ----> 2y = 30

y = 15

sub into #1

x+y=22

x+15=22

x=7

sub into #2

x+z = 9

7+z = 9

z = 2

we have 7 horses, 15 pigs, and 2 cows

- 7th grade math -
**Abby**, Wednesday, May 15, 2013 at 8:35pmThanks Reiny :) (sorry its all ratchit and says lexie b/c my 'lil sis was putting a ? And 4got 2 put it back to Abby)

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