We have not discussed methods by which systems of first-order differential equations can be solved

We have not discussed methods by which systems of first-order differential equations can be solved. Nevertheless, systems such as (2) can be solved with no knowledge other than how to solve a single linear first-order equation. Find a solution of (2) subject to the initial conditions x(0)= x_0, y(0)=0, z(0)=0.
dx/dt=-λ_1 x
dy/dt=λ_1 x-λ_2 y
dz/dt=λ_2 y

#DifferentialEquations
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