As per my understanding from your question, I'm replicating the said information using the below code:
x1 = 1:5;
y1 = 1:5;
x2 = 8:13;
y2 = 2:7;
plot(x1,y1,x2,y2)
% or plot(x1,y1) use hold on then plot(x2,y2) and use hold off
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