Definition
Suppose we have the linear system,
(
x 0 (t) = a1 x(t) + b1 y (t) + f (t)
,
y 0 (t) = a2 x(t) + b2 y (t) + g (t)
with initial values x(0) = x0 and y (0) = y0 . The Laplace
Transform of the system becomes,
(
sX (s) − x(0) = a1 X (s) + b1 Y (s) + F (s)
,
sY (s) − y (0) = a2 X (s) + b2 Y (s) + G (s)
which can be solved to get
(
b1
Y (s) +
X (s) = s−a
1
a2
Y (s) = s−b2 X (s) +
x(0)
1
s−a1 F (s) + s−a1
y (0)
1
s−b2 G (s) + s−b2
. Example
Solve the linear system. Suppose x(0) = 3 and y (0) = 2.
(
x 0 (t) = 2x(t) + 0y (t) + e t
y 0 (t) = 0(t) + 3y (t) − e t Example
Solve the linear system. Suppose x(0) = 1 and y (0) = 2.
(
x 0 (t) = x(t) + y (t)
y 0 (t) = −2x(t) + 4y (t) Example
Solve the linear system. Suppose x(0) = 1 and y (0) = 2.
(
x 0 (t) = 0x(t) + 2y (t) + e t
y 0 (t) = −x(t) + 3y (t) − e t
Section 9.2: Solving Linear Systems.pdf
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