Question: how do i solve the systems of differential equations

hi

would u please to help me in solving this system of this equation.

diff(x1(t),t)+x1(t)+0.03x2(t)+0.01y1(t)+0.02499y2(t)+.009y3(t)=0

diff(x2(t),t)+0.833x1(t)+0.69985x2(t)+0.13745x3(t)+0.02499y1(t)+0.06245y2(t)+.00227159y3(t)=0

diff(x3(t),t)+0.109073x2(t)+0.195455x3(t)+0.00909y1(t)+0.02271591y2(t)+.00826281y3(t)=0

diff(y1(t),t)=0

diff(y2(t),t)=0

diff(y3(t),t)=0

isc:x1(0)=0,x2(0)=.83,x3(0)=-4.54,x1(100)=0,x2(100)=0,x3(100)=0

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