matlab中求出了微分方程组的解，不会画相图和波形图，各位解答一下

clear all
syms x y z
[y,z]=dsolve('Dy=3y-2z','Dz=2*y-z','x')

y =

C1exp(x) + (C2exp(x))/2 + C2xexp(x)

z =

C1exp(x) + C2x*exp(x)