A carpenter purchased 50 feet of redwood and 90 feet of pine

[tseday871221]

A carpenter purchased 50 feet of redwood and 90 feet of pine, for a total cost of $31.20. A second purchase, at the same prices, included 200 feet of redwood and 100 feet of pine, for a total cost of $78.00. Find the cost per foot of red wood and of the pine.

 

[Mrspi]

Re: A carpenter purchased 50 feet of redwood and 90 feet of

A carpenter purchased 50 feet of redwood and 90 feet of pine, for a total cost of $31.20. A second purchase, at the same prices, included 200 feet of redwood and 100 feet of pine, for a total cost of $78.00. Find the cost per foot of red wood and of the pine.

let r = cost per foot of redwood
let p = cost per foot of pine

50r + 90p = 31.20
200r + 100p = 78.00

Ok...now you have a system of equations. Solve by your favorite method. If you get stuck, please repost showing the steps you have taken to find the solution.