Transform the given equation
u^('')+2.5u^(')+2u=7sint
into a system of first order equations.
x_(1)^(')=x_(2)
x_(2)^(')=7sint+2x_(1)+2.5x_(2)
x_(1)^(')=x_(2)
x_(2)^(')=7sint-2x_(1)-2.5x_(2)
x_(1)^(')=x_(2)
x_(2)^(')=7sint-4x_(1)-2.5x_(2)
x_(1)^(')=x_(2)
x_(2)^(')=7sint-2.5x_(1)-2x_(2)
x_(1)^(')=x_(2)
x_(2)^(')=7sint+2.5x_(1)+2x_(2)