inequality on 84 ---> Nspire

[tmb-Travis]

1 Remember on the 84 how we could type in y1= (7x+9) > (10x - 10)
Zoom6 and check our work/answer? Is there an equivalent on the
Npsire?


2 Also, is there a fast way to restore the y= back to f(1)=
after backspacing to use ineq.? I had to BClear Scratchpad.

thanks.

[Nelson Sousa]

1.

Expressions like expr1 < expr2 would return 1 or 0 depending on whether they were true or false.

On the Nspire you can use the piecewise template or a when statement, when( (7x+9)  >  (10x - 10) , 1, 0)

By the way, although the shortcut on the 84 is nice, it's not mathematically accurate. a>b is either true or false, not 1 or 0. true=1 and false=0 is merely a convention. Plus, it doesn't make much sense to compute sin( Pi/((1<2) + (0>-2)) ) and get 1, right? ;)

2.

Just delete the inequality. It will disappear. y< or y> don't replace f1; so if you move the cursor down on the entry line you'll see that f1 is still there.

Cheers,

Nelson

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[tmb-Travis]

#2 Sorry to be dim here.....
I tried to delete, but it seems to 'revert' on the Entry line.
I tried making it y= but it reverts
I can delete the graph line itself on the grid, but I cannot delete
from the Entry Line.

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[Lana Golembeski]

Are u in the Transform App? If so, exit the app and all should b well

Sent from my iPhone
Lana

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[tmb-Travis]

I'm not on 84 [that Transform app can be tricky--can only graph one
equation at a time]. thanks though.
I'm on Scratchpad graph. I'm trying to avoid 'Delete All' menu
choice. or BClear.

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[Nelson Sousa]

You're right, my bad.

Just click on the inequality graph and hit the backspace key. It will delete the inequality and with it the "y<..." on the entry line.

Nelson