Question 1083313
Linear data pair as   (t, E).
Two particular points are (0, 73.6) and (5, 77.2).



For making a linear equation fit,
{{{E=((77.2-73.6)/(5-0))t+73.6}}}, in slope-intercept form since one of your points is already the vertical axis intercept.


Simplify the slope:
{{{E=(3.6/5)t+73.6}}}
OR better,
{{{highlight(E=(18/25)t+73.6)}}}