how can i plot 2 different colors for 2nd order system using Euler method ?

I'm trying to plot an analytical solution Vs the Euler method of a function with 2 variables and 2 initial conditions. i managed to separate the 2 analytical results to give them 2 plots with 2 different colors in the figure. but both of the solutions in Euler method are in the same color, how can i separate them to give them different colors ? *THE PDF FILE IS ATTACHED WITH THE CODE AND PLOT