MTH 110, college algebra

Question

An advertiser goes to a printer and is charged $42 for 100 copies of one flyer and $57 for 249 copies of another flyer. 

The printer charges a fixed setup cost plus a charge for every copy of the flyer. 

Find a function that describes the cost of a printing job, if  is the number of copies made. (You must either use fractions or numbers with 3 decimal places of accuracy.) 

Answer 1

y = mx + b

(100,4200) and (249,5700) are on the line, with the amounts in pennies

the slope is 1500/149 = 10.067114+

B = y - mx = 4200 - 10.067114+*100

= 3193.2886

so the line is

y = $31.93 + 0.10067*x

'