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TI-89 series

The TI-89 and the TI-89 Titanium are graphing calculator s developed by Texas Instruments. They are differentiated from most other TI graphing calculators by their computer algebra system, which allows symbolic manipulation of algebraic expressions. For example, equations can be solved in

Question:What are the steps, if any, to solve a system of equations by graphing on a TI-89?

Answers:Let's say you are given the system: { x + y = 13. . . . . . . . . . . . . . . . . . .(1) { 2x + 7y = 28. . . . . . . . . . . . . . . . .(2) Basically, you'll need to convert the equations given into point-slope form. The first one can be written as: y = -x + 13. The second can be written as: 7y = -2x + 28 ==> y = (-2/7)x + 4. Now, you'd graph y = -x + 13 and y = (-2/7)x + 4 and use the intersection feature (on a TI-84, you'd do 2nd --> CALC --> intersect, but I think the TI-89 is different. You'll need to consult your manual or an online guide for this) to find the point of intersection. I get that these intersect at x = 12.6 and y = 0.4. I usually don't solve system of equations with my graphing calculator by graphing. I usually set up an augmented matrix (I'm not sure if you have learned how to do that yet or not) and then find the reduced-row echlon form of it. Solving a system by graphing with a TI calculator (unless it has 3D features) can only be done with a 2x2 system. Using matrices will allow you to solve a system of unlimited size, or whatever the highest the calculator can handle (you won't be needing more than what it can handle anyways). I hope this helps!

Question:i just ordered a ti 89 graphing, but i am not sure if i should have gotten ti 89 titanium cause its better for the SATs or something?

Answers:Either one will work great for you. The Titanium has a faster processor and more RAM which will probably not even be noticed.

Question:When i was in 8th grade last year i took algebra, and the school supplied me with TI-83 plus graphing calculator (which i had to give back at the end of the year). Now, my friend takes algebra, in the ninth grade, and doesnt have one. i realize its not the only way to do algebra but it sure did make it a lot easier. He is coming over today asking for help with algebra and he isnt the sharpest knife in the drawer. sorry if i am boring you but i thought i'd describe the situation. lol

Answers:Sorry, but there are nearly no online TI-8x calculators available (at least I haven't seen one), and all emulators require you to already own a TI calculator. Emulators require the use of a ROM image, one of which you can obtain from a calculator you own; using someone else's ROM or downloading one off the Internet is illegal. So I would suggest using other online graphing calculators. They won't be as easy to use, but that's the best you can do. If you're still interested in emulators, here are some of the most popular ones that support the TI-83/84/+/SE: http://www.ticalc.org/archives/files/fileinfo/261/26120.html http://sourceforge.net/projects/wabbitemu/ http://www.ticalc.org/archives/files/fileinfo/372/37211.html Again, you'd still need a valid ROM image in order to make them work.

Question:I need to buy a graphing calculator for my calculus class and I was wondering which one of these two is better. I heard the nspire wasn't very powerful when it came to 3d graphing, is this still true or has it changed? Are there any features one or the other has/hasn't?

Answers:I would suggest TI-Nspire CAS with Touchpad *Ti-nspire cas handheld with touchpad. Allows educators and students to explore mathematical expressions in symbolic form *On the home screen you can quickly perform calculations and graphing using the scratchpad. *Also includes tis first learning handheld with touchpad technology operating more like a computer and making it easier to navigate. *Handhelds can use the ti-nspire rechargeable battery (not included). Clamshell package. http://www.amazon.com/Texas-Instruments-N2CAS-CLM-2L1/dp/B003EK7O1G/?tag=klnprk-20 Also check out at Ebay there are really good deals going http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574865779&toolid=10001&campid=5336440665&customid=klnprk&mpre=http%3a%2f%2fshop.ebay.com%2fi.html%3f_nkw%3dguitar%26_sacat%3d0%26_odkw%3dguitar%26_osacat%3d0%26bkBtn%3d%26_trksid%3dm270