# bboyArthur

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• It is nice to hear my tutorials are appreciated.I am not going to write a tutorial on drawing with the Ti84, so you will have to google. I do have some quick tips. The most usefull functions for making a program which can draw are the Pxl-On, Pxl-Off and Pxl-Change functions. With these functions you can select individual pixels and turn them on or off. Also the line function can be very helpfull. The exact syntax you will have to google. I reccommend you to play with those functions a lot before building an actual program with them.If you have a drawing you frequently need, you can store and recall them with the StorePic and RecallPic functions. All these functions can be found under DRAW (2nd PRGM)Good luck!

• If you want to output the calculations on the screen of your calculator, you should take a look at the output function.If you would want to output the calculations to your computer I am affraid I will have to redirect you to google, because I cannot help you with that.

You can find all the symbols you need for this kind of if statements under 'test' (2nd, MATH).

• This calculator does not work with symbolic variables, so as long as x is not definde -2x/3->y will give an error.First of all, the program you are trying to make will only work with linear equations. You can also use the solve() function. With this function you could also find the intersection of two non linear equations. You could for instance make a program which would calculate the intersection between y1 and y2 which you can edit in the same place where you can edit the functions to plot. For more info on this function, check out this link: http://www.dummies.com/education/graphing-calculators/how-to-use-the-ti-84-plus-calculators-solve-function/If you really want to build the program like you sugested, there will be some complex mathatical tricks.First thing I would do is calcula…

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This calculator does not work with symbolic variables, so as long as x is not definde -2x/3->y will give an error.First of all, the program you are trying to make will only work with linear equations. You can also use the solve() function. With this function you could also find the intersection of two non linear equations. You could for instance make a program which would calculate the intersection between y1 and y2 which you can edit in the same place where you can edit the functions to plot. For more info on this function, check out this link: http://www.dummies.com/education/graphing-calculators/how-to-use-the-ti-84-plus-calculators-solve-function/If you really want to build the program like you sugested, there will be some complex mathatical tricks.First thing I would do is calculate the slope both lines. You can calculate this by imagining f and c to be zero and calculating y/x. So these two would be: R=-a/b and P=-d/e. In which I have named the slopes R and P.The these lines with f and c zero intersect at the origen (0,0). Then with these slopes and the cut off of these lines, which are O=c/b and Q=f/e you could calculate the movement of the intersection due to the movement of the lines.

• I'm glad you figured out the previous problem.All programs are stored on the RAM, so it makes sense they disappear when your clear this memory. Luckily there is a solution. Before clearing or resetting your RAM, move the program's you want to keep to the archive memory. I quote from step 14 of my advanced tutorial: 'You can archive any program or picture by going to MEM, Mem Mgmt/Del..., All... Select the program/picture you want to archive and press enter.'For more information about the Archive memory, check out step 14 of my advanced tutorial.Good luck!

Everything you say is correct and unfortunately there is no solution to this. I would recommend to always store your programs in archive, unless you are running or editing them. After you are done with them, directly put them back in the archive. When the programs are in archive while changing the batteries, they won't be removed. Also, change the batteries as soon as the calculator starts warning you they are running low.If you have some programs you really do not want to lose, you could think about making a backup on your computer. My advanced tutorial explains how to do this.

• Thank you. You need to be carefull when choosing a lubricant. First of all, WD40 actually is not a lubricant, but a cleaner. It works great when cleaning the axes, but it's lubrication properties are only short term. Synthetic machine oil might be better for lubrication. Just make sure the lubricant you use is actually a lubricant and not something like cutting oil. Also, when using polymer bushings, make sure the lubricant will not desolve the bushings.The choice of lubricant effects the service life of your 3D printer, as well as the quality of the prints it delivers.