SOLUTION: A carpenter purchased 50 ft of redwood and 80 ft of pine for a total cost of $280. A second purchase, at the same prices, included 90 ft of redwood and 70 ft of pine for a total co

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A carpenter purchased 50 ft of redwood and 80 ft of pine for a total cost of $280. A second purchase, at the same prices, included 90 ft of redwood and 70 ft of pine for a total co      Log On


   

Question 1184065: A carpenter purchased 50 ft of redwood and 80 ft of pine for a total cost of $280. A second purchase, at the same prices, included 90 ft of redwood and 70 ft of pine for a total cost of $393. Find the cost per foot of redwood and of pine.
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
price for redwood, r
price for pine, p

system%2850r%2B80p=280%2C90r%2B70p=393%29
Solve the system in whatever way you are required, or how you want.