Line styles and markers enable you to discriminate different plots on the same graph when color is not available. For example, the following statements create a graph using a solid ('-*k') line with asterisk markers colored black and a dash-dot ('-.ok') line with circular markers colored black.
x = 0:pi/15:4*pi;
y1 = exp(2*cos(x));
y2 = exp(2*sin(x));
plot(x,y1,'-*k',x,y2,'-.ok')
