# HP 49g+ User Manual Page 233

Graphing calculator.

Notice that the right-hand sides of the two equations differ only in the sign
between the two terms. Therefore, to write these equations in the calculator, I
suggest you type the first term and store in a variable T1, then the second term,
and store it in T2. Writing the equations afterwards will be matter of recalling
the contents of T1 and T2 to the stack and adding and subtracting them.
Here is how to do it with the equation writer:
Enter and store term T1:
Enter and store term T2:
Notice that we are using the RPN mode in this example, however, the
procedure in the ALG mode should be very similar. Create the equation for
σ
: J@@@T1@@@ @@T2#@@ + ~‚s ~‚t ` ™ ‚Å
θθ
Create the equation for σ
: J@@@T1@@@ @@T2#@@ - ~‚s ~„r `
rr
™ ‚Å
Put together a vector with the two equations, using function
ARRY (find it
using the command catalog ‚N) after typing a 2:
Now, suppose that we want to solve for P
and P
, given a, b, r, σ
, and σ
.
θθ
i
o
rr
We enter a vector with the unknowns:
Page 7-3