The equation of the line through $(x_1,y_1)$ and $(x_2,y_2)$ on a plot of $y$ versus $x$ is

Values of a variable $(f)$ are measured at several times $(t)$ :

$\backslash$table$[[f,1,4,8],[t,1,2,3]]$

Show that if two$-$point linear interpolation is used $($a$)$