Texas Instruments TI-89 Manual De Usuario
Symbolic Manipulation
261
To see intermediate results, you can manually solve the equation step-by-step.
Note:
An operation such as
|
2
p subtracts 2x from both sides.
Solving a System of Linear Equations
Solving a System of Linear Equations
Solving a System of Linear Equations
Solving a System of Linear Equations
To solve this system of equations, use any of the following methods.
Consider a set of two equations with two
unknowns:
unknowns:
2x
N
3y = 4
L
x + 7y =
L
12
Method
Example
Use the solve function for a one-step
solution.
solution.
solve(2x
N
3y=4 and
L
x+7y=
L
12,{x,y})
Use the solve function with
substitution ( | ) for step-by-step
manipulation.
substitution ( | ) for step-by-step
manipulation.
Substitutions are in the form of an
equality, such as x=3 or y=sin(x). To
be most effective, the left side should
be a simple variable.
See ”Symbolic Manipulation” in the
Previews chapter, which solved for
x =
equality, such as x=3 or y=sin(x). To
be most effective, the left side should
be a simple variable.
See ”Symbolic Manipulation” in the
Previews chapter, which solved for
x =
L
8/11 and y =
L
20/11.
x
«
y
|
5
Á
2x
|
5y
|
2 x
|
y
«
5
p ?
1