<p>Oh, and do you think constantly turning the calculator on or off is bad? I turn it off for every few seconds when I'm not looking at it. Should I just leave it on?</p>
<p>I don't understand how to do a system of equations. Do I use the solve button enter the first equation, comma single variable then close parenthesis, hit and, then open parenthesis and do the same thing? Its not working. </p>
<p>Someone use this example: x^2-y^2=77 and x+y=11</p>
<p>solve(eqn1 and eqn2, {x,y})</p>
<p>No problem Kilini. I leave my calculator on when I'm working with it, it turns off by itself if it's left on too long. </p>
<p>Okay, yojo, you're problem:</p>
<p>Go to F2, hit enter on the solve(</p>
<p>Okay, now put in your 2 equations.</p>
<p>solve(x^2-y^2=77 and x+y=11, x)
[hit enter]
x=9 and y=2</p>
<p>Get the "and" from the catalog button next to the mode button or just use the letter keys to type it in. And that's it. :)</p>
<p>Thanks for your help. I was trying to find example problems in my CB book and I found this one, but I don't know how to enter it on my 89 because of all the parenthesis needed. Number 8 on 596:</p>
<p>(a^.5 b^1/3)^6 </p>
<p>I'm looking to enter it under solve.</p>
<p>If someone could show me the steps it'd be most appreciated.</p>
<p>A TI-89 for advanced calculus is a worthy investment, but for the SAT it is superfluous. You really don't even need a calculator to get an 800 in math.</p>
<p>I'm going to college this fall, and I'll take calculus eventually. So it was a worthy investment.</p>
<p>Besides, I can always return it within 30 days. :P</p>
<p>EDIT: Oh, and is there a guide on how to solve actual questions with the 89 and/or sat_os?</p>
<p>anyone? thanks</p>
<p>I would suggest getting a TI83 for SAT, since I heard there are some graphs on there now. Old one could be done with a standard calculator.</p>
<p>Really, you don't need the Ti89, but it is nice. But I would be skeptical of your abilities if you got it only 4 days before the test. It might hurt you.</p>
<p>Advice = learn to flex the symbolic features. You can do crazy **** w/ matrices, etc, using variables.</p>
<p>Yojo I don't have the book, and you can't use the solve because you have to let something = something, and solve for some unknown variable. Is it what you have = 0?</p>
<p>Sorry, =432</p>
<p>And you're multiplying the a^(1/2) X b^(1/3) ? Is that right? Cuz I did that and I got an answer but it's a=something with variable b in it and vice versa.</p>
<p>If that's the case, then I would plug in, seriously it seems like the fastest way. Or you can actually solve it "algebraically" by hand..</p>
<p>Well, is it possible on the calc? Because it then asks you to find out what AB is, which eliminates plugging in.</p>
<p>Well..I plugged it in, and asked it to solve for AB, here's exactly what I got:
1 = 432
a^3 X b^2</p>
<p>Which means a^3 X b^2 = 432
Which doesn't help much I suppose..
I don't know if you could solve this with the calculator.
And I just put in random info and it took me about a minute to find 3^3 X 4^2 = 432, and I don't even know the answer choices.
So..I dunno..you decide if there is a better way to find the answer, I'm sure there is.. but I found the answer anyway (12 right?), and it took about a minute total time. Hmm.</p>
<p>Well, I tried the equation of (a^1/2 * b^1/3)^6=432 using a combination of solve and exact - here's what I found:</p>
<p>(1/a^3)>- 0 and b = (12*(sq. root of 3))/(a^(3/2))</p>
<p>So I would say pick a value for 'a' that's within the interval and see what happens.</p>
<hr>
<p>**Also, if you want to download the latest version of SAT_OS for your TI-89 at:</p>
<p>There's a manual + animated-walkthrough screenshots to help you get a feel for the format - any questions just pm me or post :D</p>
<p>P.S - It's just been updated - new features + touch-ups! :)</p>