Question 297887
I hope this meets with your demanding schedule. 
{{{y-y1=((y2-y1)/(x2-x1))(x-x1)}}}
Then you can solve either of these to get your answer.
{{{y-(-6)= ((-16-(-6))/(8-0))(x-0)}}}
{{{y-(-16)= ((-16-(-6))/(8-0)) (x-8)}}}