Question 460384
Plot {{{V(t)}}} on the vertical axis
Plot {{{t}}} on the horizontal axis
Get the equation into the form  {{{ V(t) = m*t + b }}}
where {{{m}}} = slope
{{{b}}} = {{{V}}} intercept
Slope  = ( change in V ) / ( change in t )
{{{ m = (200 - 1800) / (5 - 0) }}}
{{{ m = -1600/5 }}}
{{{ m = -320 }}}
So far:
{{{ V(t) = -320t + b }}}
{{{ V(0) = 1800 }}}
{{{ 1800 = - 320*0 + b }}}
{{{ b = 1800 }}}
The equation is {{{ V(t) = -320t + 1800 }}}