Problem
A student government organization is selling Christmas trees as a fundraiser. On Friday, they sold 5 noble fir trees and 3 douglas fir trees for a total of \( \$ 420 \). On Saturday, 12 noble fir trees and 9 douglas fir trees were sold for a total of \( \$ 1,080 \). What is the cost per tree for each type? Cost of Noble Fir tree (in dollars) Cost of Douglas Fir tree (in dollars)
Solution
Step 1 ：\(5x+3y=420\)
Step 2 ：\(12x+9y=1080\)
Step 3 ：\(x=60\),\(y=40\)
