How can I connect points from different plots

I created three different sets of points on a graph, now I want to connect those points with one line, but I don't know how to do this since they are different sets. Does anyone have an idea?

x1= [2:10:300];
n1=[0:6:179]
y1=[n1];

x2= [4:10:300];
n2=[2:6:179];
y2=[n2];

x3= [6:10:300];
n3 = [2:6:179]
y3=[n3]

plot(x1,y1,'o')
hold on
plot(x2,y2,'o')
plot(x3,y3,'o')

Answer 1

[KALYAN ACHARJYA]

Use the following line at last in the code-

line([x1,x2,x3],[y1,y2,y3],'Color', 'b');

[madhan ravi]

x1= [2:10:300]; 
  % ^--------^----- are superfluos! 

[KALYAN ACHARJYA]

@Madhan ravi Sir I didnot check the code. Thanks for pointing.

[Joyce de Heer]

Thank you for your help but can I get one line, going through all the different points instead of three seperate straight lines? Like, one line connecting all the points together

[KALYAN ACHARJYA]

Use the following with different colors

line(x1,y1,'color','y');
line(x2,y2,'color','m');
line(x3,y3,'color','b');

[Joyce de Heer]

These are still three lines, I'd like one line, zigzagging through all the points, is that possible?