How to upload a text file for a curve fit?

I am trying to upload a text file so that i can use the data to create a reciprocal curve fit.

data1= importdata('10_Reciprocal.txt'); data=data1.data; x= data1(:,1); y=data1(:,1);

hold on p=polyfit(x,1./y,1); m=p(1); b=exp(p(2)); fplot(@(x) (1/m*x+b),[x(1) x(end)])