Question 26256
Let D. Trees be x
Let P, trees be y
Now; together they equal 850 trees
so: x+y=850 (solve for y)
y=850-x (subsitution)
D. trees cost $300 and P. trees cost $225
together there cost equal $217500 that includes the amount of tree they buy..
Now the amount are unknown so the equation is.
300x+225y=217500 (subsitue for y)
300x+225(850-x)=217500
300x-225x+191250=217500
75x=26250
x=350
y=850-350
y=500.


Hence, there were 350 D. trees bought, and 500 P. trees bought.
Paul.