point 1...950,000$/35,000 tons=27.14285 $/ton . . . point 2...1,150,000$/45,000=25.5555$/ton . . . assume strate line...y=mx+b, y=$/ton, x=tons . . . 2 points:(35,000, 27.14285) & (45,000, 25.5555) . . . deltax=45,000 -35,000=10,000 . . . deltay=25.5555 -27.14285=-1.58735 . . . slope=deltay/deltax=-1.58735/10,000=-1.58735*10^-4 . . . tu find b, projekt line tu x=0....from 45,000 tu 0=-45,000 . . . deltay=slope*deltax=(1.58736*10^-4)*(-45,000) . . . =1.58735*(-4.5)=-7.143075 . . . thus, y at x=0 is 35,000 -7.143075=34,993