Connecting a line from the first data point to the last data point

I have a 2D scatter plot. I am trying to create a line that connects from the very first data point to the very last data point only. I would appreciate any help. I have a total of 40 data points.

Answer 1

[Fangjun Jiang]

x=1:10;
y=rand(size(x));
scatter(x,y);
line(x([1 end]),y([1,end]))

[birdnerd007]

Thank you kindly!