SAT Question 038d87d7: Linear Equations In Two Variables answer and explanation with Desmos solution

Choice A is correct. It's given that a neighborhood consists of a $2$ -hectare park and a $35$ -hectare residential area and that the total number of trees in the neighborhood is $3,934$. It's also given that the equation $2x+35y=3,934$ represents this situation. Since the total number of trees for a given area can be determined by taking the number of hectares times the average number of trees per hectare, this must mean that the terms $2x$ and $35y$ correspond to the number of trees in the park and in the residential area, respectively. Since $2x$ corresponds to the number of trees in the park, and $2$ is the size of the park, in hectares, $x$ must represent the average number of trees per hectare in the park.