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Monday, January 3, 2011

hw #5-3 Point-Slope Form... aka "My Cousin Vinnie"

hw #5-3
pg 316 #1-7 All
            #9-33 Odd

P.S. Since you have a QUIZ on Friday, you should be able to answer EVERY QUESTION in the mid-chapter quiz (pg 319) EXCEPT FOR #7-9, which we will cover next week. Might as well take a look at it sooner than later (you're welcome!)
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22 comments:

  1. AnonymousJanuary 3, 2011 at 4:06 PM

    did you grade the test corrections yet?

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  2. JustinJanuary 3, 2011 at 5:05 PM

    i got a question...
    what should i put for #5, are those the things we spent a little time with in class today
    like vertical change over horizontal change and rise over run..?

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  3. AnonymousJanuary 3, 2011 at 6:00 PM

    Is the slope for #4 2/1 or 4/5?
    I'm using the rise/run method on the graph & got 4/5 but when I did the math I got 2/1?

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  4. AnonymousJanuary 3, 2011 at 6:06 PM

    For #7 I'm not sure what to say..
    Of what I know, yes.
    ?????

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  5. Mr. ChamberlainJanuary 3, 2011 at 6:57 PM

    As for the test corrections, I'll have 'em for you on Weds. And Justin, pleaze uz propur inglish... you "gotsk" a question... do I have to teach you guys EVERYTHING??!!

    For #4, how many lines can be determined by two distinct points? Now, tell me again about your predicament?

    For #5, yup I think you're on to something there. Don't sweat it. They're just trying to melt your brain with those "reasoning" questions... I like that!

    For #7, don't just give me a yes... try to explain why. First REALLY GOOD EXPLANATION for #7 gets extra credit on Friday's quiz (yup, that's not a misprint!).

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  6. AnonymousJanuary 4, 2011 at 3:32 PM

    If you wanted to graph an equation, could you just choose a point anywhere & then decide where the next point is according to slope?

    & for #4 I still don't understand.. :(

    This is going to be hard to come up with an explanation for #7.

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  7. AnonymousJanuary 4, 2011 at 3:44 PM

    For #22, how do we figure out "b" or y-intercept?

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  8. AnonymousJanuary 4, 2011 at 3:49 PM

    Wait nevermind, for #23 it doesn't even need a y-intercept..
    I figured out how to figure it out anyway :)

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  9. AnonymousJanuary 4, 2011 at 3:57 PM

    Nevermind about graphing an equation, I just figured it out, that you can find the coordinates in the equation if it's in point-slope form.
    BRAIN FART!

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  10. AnonymousJanuary 4, 2011 at 4:01 PM

    If you had a slope of -3/1, would the one be positive and you would graph the next point moving in the positive direction horizontally or the negative direction horizontally?

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  11. AnonymousJanuary 4, 2011 at 4:11 PM

    Is the the answer to 31 b=0.0001a?

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  12. AnonymousJanuary 4, 2011 at 4:18 PM

    Wait-- that was a stupid question. Ignore the above ^^

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  13. Mr. ChamberlainJanuary 4, 2011 at 4:43 PM

    Now I know why I allow anonymous comments!

    As for a slope of -3/1...

    let's remember the many ways to describe SLOPE:
    RISE OVER RUN
    Vertical Change over Horizontal Change
    Change in y over change in x
    Change in range over change in domain
    Change in dependent variable over change in independent variable
    ... WOW, we are SOOOOO smart, eh??

    Let's also remember our BIG IDEA of

    EQUIVALENCE!!

    Compare -3/1 to 3/-1... EQUIVALENT? YES
    " " " " -30/10... EQUIVALENT? YES
    " " " " 9/-3... EQUIVALENT? YES
    " " " " 3/1... EQUIVALENT? NO!!
    " " " " -3/-1... EQUIVALENT? NO!!

    Why YES and why NO... YOU tell me!

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  14. AnonymousJanuary 4, 2011 at 5:21 PM

    Yes I ask a lot of questions :)
    Oh So I see..
    You would be moving in the negative direction because -3/1 causes the 1 to be negative as well..

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  15. Mr. ChamberlainJanuary 4, 2011 at 5:32 PM

    I'm not sure I like your how you worded your conclusion. Picture Manhattan Math (i.e. city blocks).

    If the slope for a given line is -3/1, here are some "rise" over "run" movement choices:

    RISE (move vertically) -3 then RUN (horizontally) +1
    RISE +3; RUN -1
    RISE -9; RUN +3
    RISE +30; RUN -10

    YOU CANNOT:
    RISE -3; RUN -1
    RISE -30; RUN -10

    -3/-1 is EQUIVALENT TO 3/1, which would mean a slope of +3. Remember our mural on the back wall! POSITIVE slopes slant up from left to right, while NEGATIVE slopes slant down from left to right.

    Are we on the same "plane"??

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  16. AnonymousJanuary 4, 2011 at 5:39 PM

    Yes we are!

    What if the negative sign was next to the fraction bar..?

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  17. Mr. ChamberlainJanuary 4, 2011 at 5:50 PM

    You tell me... would that make it a positive or negative number? That SHOULD answer your question... let me know.

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  18. AnonymousJanuary 4, 2011 at 5:51 PM

    Negative?

    Is it POSSIBLE to be able to Rise -3 and Run -1?

    But that would make it a positive number..

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  19. Mr. ChamberlainJanuary 4, 2011 at 6:43 PM

    A slope of -3 is equivalent to
    -3/1 or 3/-1

    it cannot be -3/-1 or 3/1, since these numbers are equivalent to +3

    Just ask Fraction Jackson... putting the negative sign next to the line between 'em simply makes it a negative number... to use the fraction as a rise over run, you'll have to move the negative sign to either the prominator or the dominator, but not both (if you move it to both, you'll convert it to a positive number - not good).

    Now if 4/3 of y'all got dat... my work is done here!

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  20. AnonymousJanuary 4, 2011 at 8:09 PM

    You're work is done, all 4/3 of me understands!

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  21. AnonymousJanuary 4, 2011 at 8:35 PM

    I'll be at my crib widda fifth an'a eighth...

    Peace Out,
    FJ

    ReplyDelete
  22. AnonymousJanuary 5, 2011 at 3:30 PM

    What?

    ReplyDelete

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