Question about Texas Instruments TI-84 Plus Calculator
Hello,
Suppose you want to draw the circle the equation of which is X^2+Y^2=4, a circle centered at the origin with radius 2.
When you isolate Y^2 and then extarct the squre root you obtain two solutions, call them Y1 and Y2
Y1=SQRT(4-X^2), Y2= -SQRT(4-X^2)
You press[Y=] and type in the right hand side of the equations above, one in Y1= and the other in Y2. Press [GRAPH].
Ih a graphic does not appear within the scree window adjust the window parameters ( [WINDOW]) or Press [ZOOM] and select ZoomIn, ZoomOut, ZoomSTD, etc.
Explore the program Draw accessible by pressing [2nd][DRAW].
Hope it helps
Posted on Sep 04, 2009
Sorry for the typos. I wrote this solution once and upon attempting to post, I got a message to the effect that the server is too busy and I lost my post. I did not want to have to write the solution a third time.
Move the cursor on the equal sign (=) to the right of Y1 , highlight the equal sign and press [ENTER]. Make sure that equal sign remains highlighted when cursor moves to another location.
If there are still problems, reset the RAM by pressing [2nd][MEM][7:RESET][1:All Ram][2:Reset] [ENTER]. Press [CLEAR] to erase Ram Cleared Message.
You didn't answer how to highlight more than just Y1... He's trying to make it so he can compare graphs. He needs it to draw Y1 and Y2 at the same time. How do you highlight both at the same time?
You didn't answer how to highlight both Y1 and Y2 at the same time so that you can graph both and compare...
On the Y= editor screen, use the back arrow on a line Y=, highlight the = sign and press Enter. Both = signs must be highlighted. If only one is highlited, that is the function that will be graphed. As to comparing , I do not believe there is much to say. Each part is the reflection of the other with respect to the y=0 (the x-axis) line.
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Posted on Jan 02, 2017
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