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7th grade math

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Horses, pigs and cows is really easy I can do it in my head but, my teacher told me I would have to start showing my work. I really have no clue how to do that I have always done it in my head. Can you pretty please help me I would gladly appreciate it. Thank you. :)

  • 7th grade math -

    I don't know what's in your head!!

    What is the problem?

  • 7th grade math -

    Thanks Ms.Sue!!
    My teacher gave me an example (I don't know so sorry)
    12 = h
    Thanks (it's really confusing)

  • 7th grade math -

    Please post a problem that you did in your head, and I'll try to help you.

  • 7th grade math -

    (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 -

    Are 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

    sub into #2
    x+z = 9
    7+z = 9
    z = 2

    we have 7 horses, 15 pigs, and 2 cows

  • 7th grade math -

    Thanks 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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