Question 259627
The points are (6,1.65) and (16, 3.65)
Here we have x,c instead of x,y
c-c/x-x=m 
3.65-1.65/16-6=m
2/10=1/5
c=1/5*x+b
1.65=1/5(6)+b
1.65=6/5+b
1.65*5/6=b
1.375=b
C=x/5+1.375