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Math Help - how to make Y the subject? Ti-89

  1. #1
    Junior Member User Name's Avatar
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    Question how to make Y the subject? Ti-89

    Hi to all great members and staff

    I was wondering how could I make the Y subject for making a equation for this question with ti 89
    this is the straight line equation fill out by numbers:
    y-3=-1(x-2/6)
    how can I make the subject Y?By using cal, Thanks
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  2. #2
    Flow Master
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    Quote Originally Posted by User Name View Post
    Hi to all great members and staff

    I was wondering how could I make the Y subject for making a equation for this question with ti 89
    this is the straight line equation fill out by numbers:
    y-3=-1(x-2/6)
    how can I make the subject Y?By using cal, Thanks
    You're kidding, right? I really do hope you know that to make y the subject you just add 3 to both sides.

    Perhaps you meant to ask how to make x the subject (maybe you're trying to find the inverse function). In which case:

    solve(y - 3 = -1(x - 2/6), x)

    does the trick. However, you really should be able to do this with out using a CAS.
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    You're kidding, right? I really do hope you know that to make y the subject you just add 3 to both sides.

    Perhaps you meant to ask how to make x the subject (maybe you're trying to find the inverse function). In which case:

    solve(y - 3 = -1(x - 2/6), x)

    does the trick. However, you really should be able to do this with out using a CAS.
    no mate,
    you got me wrong I know the trick you gave me already!
    I want the Y as the subject!
    like Y= blah blah :d
    the one you did gives the value of X!
    Thanks
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  4. #4
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    Quote Originally Posted by User Name View Post
    no mate,
    you got me wrong I know the trick you gave me already!
    I want the Y!
    like Y= blah blah :d
    Thanks
    If you really need to use a CAS for that question, then you're going to have big big problems down the track with your maths (assuming you continue with maths down the track). You're strongly advised to work on your 'by-hand' skills now while you still have time.
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  5. #5
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    Quote Originally Posted by mr fantastic View Post
    If you really need to use a CAS for that question, then you're going to have big big problems down the track with your maths (assuming you continue with maths down the track). You're strongly advised to work on your 'by-hand' skills now while you still have time.
    I can do it "by hand" but i was just trying to save the time!
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  6. #6
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    Also in addition the equation I just gave you it's from straight line equation and the Q wants the normal and the tangent of the equation!
    So...
    I know that's really easy version! er can solve it by take the 3 to other side, however that's not all it's asking mate,
    I will try to scan the original question by tomorrow!
    hope you get me:S
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  7. #7
    Moo
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    Quote Originally Posted by User Name View Post
    no mate,
    you got me wrong I know the trick you gave me already!
    I want the Y as the subject!
    like Y= blah blah :d
    the one you did gives the value of X!
    Thanks
    So just write the same thing as mr f, but solving for y... If you knew the trick, you should have understood that !

    solve(y - 3 = -1(x - 2/6), y) gives y with respect to x.............

    now, for having used my TI-89 for 7 or 8 years, I strongly advise you not to try to save time, for this kind of things.
    You will spend less time by doing it by hand than typing it on the calculator.


    If you want to check, okay, but don't do that in an exam.
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  8. #8
    Bar0n janvdl's Avatar
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    Quote Originally Posted by User Name View Post
    Hi to all great members and staff

    I was wondering how could I make the Y subject for making a equation for this question with ti 89
    this is the straight line equation fill out by numbers:
    y-3=-1(x-2/6)
    how can I make the subject Y?By using cal, Thanks
    Short and sweet lol:

    y = -1(x-2/6) + 3

    (But if you do know how to do it by hand, home come you didn't just do it??)
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  9. #9
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    Quote Originally Posted by User Name View Post
    I can do it "by hand" but i was just trying to save the time!
    Huh? It takes a split second to mentally solve for y, and then you write it down. Your idea is to instead spend several long seconds typing the equation into the calculator, and then to write down the output displayed on the screen? That does not sound very efficient to me.
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  10. #10
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    Cool

    Guys!

    The equation I gave out is made by me with easy setups, the real one in my book is longer and has combined with many other equations!
    I KNOW AND I CAN GET THE THE EASY EQUATION SO PLEASE DO NOT SAY THAT'S EASY OR BLAH BLAH, THAT'S MEANT TO BE EASY COZ I MADE IT EASY!!!
    i just wanted to use the trick in further and harder equations!
    HOWEVER!
    I found the trick! by just messing around with my cal like a hour! seems you all didn't know it as well a I! so I share it hear so you'll know it!=)
    Here is it:
    If you want to make a Y or anything the subject of the equation you just type the equation and enter than press ANS - Y!
    Simple!
    that's take the Y out so it makes it the equation!Happy)not the gives the VALUE!,Y!

    Thanks every one!
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