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Q: Solving a Basic Algebraic Equation on the Texas Instruments TI-83 Plus ( Answered ,   0 Comments )
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 Subject: Solving a Basic Algebraic Equation on the Texas Instruments TI-83 Plus Category: Computers > Hardware Asked by: craveonewave-ga List Price: \$10.00 Posted: 16 Oct 2003 06:33 PDT Expires: 15 Nov 2003 05:33 PST Question ID: 266857
 ```How do you solve a basic algebraic equation, such as 3x+7=28, on the TI-83 Plus? I am not trying to graph the equation, I just want to be able to find the value of x. When answering could you please list the steps you take to do it on the calculator and provide atleast three other examples. This is my first Google Ask question so if their are any problems please tell me. Thanks!```
 Subject: Re: Solving a Basic Algebraic Equation on the Texas Instruments TI-83 Plus Answered By: bobby_d-ga on 16 Oct 2003 17:41 PDT Rated:
 ```Hi, and thank you for your question! Texas Instruments actually have a very good support system at their website. They in fact have the entire 'guide book' for the TI-83 Plus (in PDF form) on their website: http://education.ti.com/us/product/tech/83p/guide/83pguideus.html If you do not have 'Adobe Acrobat Reader', you will not be able to read the 'guide book'. You can download this software at the following website (it is a valuable program - PDF files are used frequently around the internet): http://www.adobe.com/products/acrobat/readstep2.html The particular feature that you are looking for is described in chapter 2 under 'Using the Equation Solver': http://education.ti.com/downloads/guidebooks/eng/83m02eng.pdf I have generated my own instructions from this guidebook (and have also had some experience with similar calculators): 1. Start the 'Equation solver'. Do this by pressing [MATH]. You will see a menu. Press [0] to select the "SOLVER". (If an expression has already been placed in the EQN memory, it will appear in the 'Interactive Equation Solver'. To remove this, use the CURSOR UP KEY to move the cursor onto the LINE WITH THE EQUATION (the top line). Then press CLEAR. You may now enter your own equation.) 2. Now, enter your own equation. You should at least read the first chapter of the guide book to understand the basics about 'order of operations' and generally the ways by which to enter an expression. NOTE: The expression is assumed to be equal to zero, so some algebraic juggling may have to take place - I will do that below. 3. Press ENTER. The 'Interactive Equation Solver' will be displayed. It will show your variable as = 0 in the next line, and then show the bounds of the search, which will be at a default value and do not need to be changed. 4. Now press ALPHA then the button marked ENTER (but by pressing ALPHA, you are activating the SOLVE function of this button - you will see it above in green). The value will be displayed after your variable. I will now give you 3 examples, as you requested. 1. 3x + 7 = 28. To begin, we must juggle the equation such that one side = 0. Do this by deducting 28 from both sides of the equation. Therefore, 3x - 21 = 0 Press [MATH]. Press [0]. (Note that 'X' need not be used as the variable when entering the equation) Press [3]. Press ALPHA then MATH to use 'A' as a variable. Press [-]. Then press [2] [1]. Press [ENTER] Press [ALPHA] [ENTER] The correct value (7) should be displayed after the "A =" that has appeared on the screen. 2. 5x - 20 = 100 Rearrange by deducting 100 from both sides -> 5x - 120 = 0 Press [MATH]. Press [0]. Press [5] [ALPHA] [MATH] [-] [1] [2] [0]. Press [Enter]. Press [ALPHA] [Enter]. The correct value should appear after "A =" (24). 3. 17 - 2x = -1 Rearrange by adding 1 to both sides -> 18 - 2x = 0. Press [MATH]. Press [0]. Press [1] [8] [-] [2] [ALPHA] [MATH]. Press [Enter]. Press [ALPHA] [Enter]. The correct value should appear after "A =" (9). Having explained all this, I would HIGHLY recommend reading the guide book; at least the first few chapters. Note that there is another way to find the result you are looking for - but it involved plotting a graph and then using graph functions which you did not seem to want in your question. I hope this works for you! If you need any clarification, or these instructions do not seem to work, please do not hesitate to ask. Good luck with your calculator. Regards, bobby_d```
 craveonewave-ga rated this answer: and gave an additional tip of: \$2.00 ```An excellent and thorough answer! I especially like that you answerd the complete question, and didn't give a partial response. Furthermore the links to TI ARE invaluable; and you listed how to do each step on the calculator itself. This was an A+ response!```

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