SAT Question 590d662d: Linear Functions answer and explanation with Desmos solution

It’s given that the graph shows the total distance $y$, in meters, Mary had walked on the trail $x$ minutes after leaving the trail sign. The graph represents a linear relationship between time and distance, so the distance walked in a given time interval corresponds to the change in the $y$ -values over that interval. At $x=0$, the graph shows a $y$ -value of $150$, and at $x=10$, the graph shows a $y$ -value of $650$. The distance Mary walked in the $10$ minutes after leaving the trail sign is the difference between these $y$ -values, which can be written as $650-150$, or $500$. Therefore, the distance, in meters, Mary walked in the $10$ minutes after leaving the trail sign is $500$.