I would assume that he's using a 90° rotation.
Ryan: y=10x+25 Alex: y=11x+20
a) Mr. Smith should choose Alex because the price would be $42 compared to Ryan which would be $45
b) Mr.Smith could choose either Ryan or Alex because they would both charge $75
255 times 3 which gets you an estimate start point
next you start at 83 then 3 more is 85 then 3 more is 87. those are your numbers
