Question 32527
You have two points and want to find the equation of the 
line through those points.
The points are (2,42000) and (6,102000)
The slope if 60000/4= 15000
Substitute into y=mx+b to find "b"
42000=(15000)(2)+b
12000=b
The equation you want is S=(15000)t+12000

Cheers,
Stan H.