Draw a line passing through two points

[pdpanchani]

How to make a line in xy graph using two points and passing through these points (not manually please)

[GerdW]

Hi pdpanchani,

put both points into one plot and display the plot in your XY graph…

What exactly is the problem? Where are you stuck?

[altenbach]

If the line should extend past the two points, do a linear fit on the two existing points, pick two new x values bounding the desired range of the line and use linear evaluation to generate the respective y values.

(all this could also be done using simple math, of course) and make a second plot with a line interpolation style.

I assume you know how to make two plots on one graph?