Guest silverbullet Posted April 22, 2004 Report Share Posted April 22, 2004 i no this isnt the fucking hw hotline or anything but i have a ti-89 and i cant find anyone who has one of these that can help me so here goes... i need to find the intersection points on a graph, and im not sure how to do it...i keep trying to go to math and then 5 for intersection, but it keeps giving me an error message so im not really sure waht to do..any one no how to do this? Quote Link to comment Share on other sites More sharing options...
Guest jpurdy2003 Posted April 22, 2004 Report Share Posted April 22, 2004 I'm pimpin' it old-school with a TI-83, which is totally different, not to mention buried with last semester's texts. Quote Link to comment Share on other sites More sharing options...
black00ws6 Posted April 22, 2004 Report Share Posted April 22, 2004 What are the equations for the 2 graphs? Quote Link to comment Share on other sites More sharing options...
Berto Posted April 22, 2004 Report Share Posted April 22, 2004 ok so here goes u have your two plots then do math>5 it will ask you for the two curves, basically just hit enter twice. then when it asks for the lower bound, lower means left. so move your cursor to any point LEFT of the intersection point (on the curve that is already selected for you. then just hit enter. its cake. Quote Link to comment Share on other sites More sharing options...
black00ws6 Posted April 22, 2004 Report Share Posted April 22, 2004 Why do you need a damn calculator to find out where 2 graphs intersect anyways... graemlins/trout.gif Quote Link to comment Share on other sites More sharing options...
Berto Posted April 22, 2004 Report Share Posted April 22, 2004 who knows what kind of equation he's dealing with. Quote Link to comment Share on other sites More sharing options...
Guest silverbullet Posted April 22, 2004 Report Share Posted April 22, 2004 alright..i figured the damn thing out..thanks for the help...apparently i needed to enter in 0 for the lower bound and any number above that for the lower Quote Link to comment Share on other sites More sharing options...
Trouble Maker Posted April 22, 2004 Report Share Posted April 22, 2004 Originally posted by silverbullet: alright..i figured the damn thing out..thanks for the help...apparently i needed to enter in 0 for the lower bound and any number above that for the lowerIf you move the cursor around like burto said you should be able to move around on each graph and select the point that way too. Read the book if you still have it, it will tell you how to do everything. Quote Link to comment Share on other sites More sharing options...
black00ws6 Posted April 22, 2004 Report Share Posted April 22, 2004 Or don't rely on the damn machine to do it and set the two graphs equal to each other and solve for x... Unless you're dealing with differential equations, those are a little different. Quote Link to comment Share on other sites More sharing options...
BIG SHAFE Posted April 22, 2004 Report Share Posted April 22, 2004 Originally posted by Crocostimpy: Or don't rely on the damn machine to do it and set the two graphs equal to each other and solve for x... Unless you're dealing with differential equations, those are a little different. Or if you are dealing with a transcendental. Neither of these can be solved for explicitly they are only solvable graphically. If you don't have you instruction manual, you can download it here. These calculators are very powerful, lean how to use them. smile.gif Quote Link to comment Share on other sites More sharing options...
Trouble Maker Posted April 22, 2004 Report Share Posted April 22, 2004 Originally posted by Crocostimpy: Or don't rely on the damn machine to do it and set the two graphs equal to each other and solve for x... Unless you're dealing with differential equations, those are a little different.Or anything above a second order equation involved, solvable by hand but very involved, let the calculator do it. It's also a good way to check your work. Diff EQ should be solved by hand; I solved them by hand and still didn't understand the shit. It's not too hard to understand that hey this linear equation intersects this one here. Differential equations aren't solvable by hand? Quote Link to comment Share on other sites More sharing options...
Guest RJ1074 Posted April 22, 2004 Report Share Posted April 22, 2004 you might try hitting i think its the "y-" button or something at the top of the calculator, then type in your two equations, then hit the "graph" button (top right) then you can hit the arrow keys and move it to the point you want to know! Quote Link to comment Share on other sites More sharing options...
black00ws6 Posted April 22, 2004 Report Share Posted April 22, 2004 Originally posted by Neo Pee: Or anything above a second order equation involved, solvable by hand but very involved, let the calculator do it. It's also a good way to check your work. Diff EQ should be solved by hand; I solved them by hand and still didn't understand the shit. It's not too hard to understand that hey this linear equation intersects this one here. Differential equations aren't solvable by hand? I had advanced diff eq. in college and we weren't allowed to use calculators for tests.. Those damn problems would take up a whole page. Hated that shit. Quote Link to comment Share on other sites More sharing options...
DeathSandwich Posted April 22, 2004 Report Share Posted April 22, 2004 .... this thread makes my brain hurt! graemlins/doh.gif Quote Link to comment Share on other sites More sharing options...
Guest RJ1074 Posted April 22, 2004 Report Share Posted April 22, 2004 dude, did any of these work? update please! Quote Link to comment Share on other sites More sharing options...
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