:Input "X1",A
:Input "X2",B
:Input "Y1",C
:Input "Y2",D
:(D-C)/(B-A)->E
:Disp "SLOPE:",E
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It all depends on what calculator you use to know how to program the formula into it.
If you have a computer, you already have the calculator that is part of the computer's program.
calculator
Once a program has been deleted on a TI-84, it is no longer in the calculator's memory. You would have to get the program from where you got it, or, if you programmed it, remake the program.
Slopes that are dangerously high and/or steep.