Question 990672
You want ordered pair points as  (percentDamaged,price).  Two points you have are (0,0.5) and (85,1.5), which you may assign coordinate variables as  (p,c).


Notice that one of these points is the c-axis intercept!  Feed everything into slope-intercept form and simplify:


{{{c=((1.5-0.5)/(85-0))p+0.5}}}


{{{highlight(c=p/85+1/2)}}}