Texas Instruments TI-89 Manual Book page 15

Example — Undefined Variable
1. Press 3 „ and set Exact/Approx to
2. Start
3. Press
and three unknowns.
4. Enter the coefficients:
a =
1,1
a =
2,1
a =
3,1
5. Press ‡ to solve the problem according to the mode
setting. The busy indicator on the status line displays while
the solution is calculated.
The values for x
x = 26à(5...(5...unkN7))+3/5
1
= M104à(5...(5...unkN7)) N7à5
x
2
= M26à(5...unkN7)
x
3
TI-89 / TI-92 Plus / Voyage™ 200 PLT Simultaneous Equation Solver App
Simultaneous Equation Solver and select
D ¸ ¸ for a problem with three equations
3 3
a = 3 a
2
1,2
M1
a = a
3
2,2
a = 2 a
3
3,2
, x
1
M2
= b1
1,3 1
= b1
unk
2,3 2
M1
= b1
3,3 3
, and x are displayed:
2 3
.
Exact
New
M3
=
M2
=
M1
=
.
Page 15