how do I write this as an equation

Question

Baltimore County Department of Natural Resources is planting trees in local parks to support the environment. Maple trees cost $50 each and oak trees cost $25 each. They spend exactly $800 for this project.

Write an equation in standard form to represent this linear relationship. Let x represent maple trees and y represent oak trees.

Answer 1

50x+25y = 800

2x +y = 32

If there are no fractional trees, that means one of the following, and requires

and even number of oak trees 2<y<30, 1<x<15

y=oak x=maple

0 16

2 15

4 14

6 13

8 12

10 11

12 10

14 9

16 8

18 7

20 6

22 5

24 4

26 3

28 2

30 1

32 0