SAT Question e86a06fe: Linear Functions answer and explanation with Desmos solution

Choice D is correct. It's given that the equation $y-5x=6$ represents the relationship between the number of suits that Kaylani made, $x$, and the total length of fabric she purchased, $y$, in yards. Adding $5x$ to both sides of the given equation yields $y=5x+6$. Since Kaylani made $x$ suits and used $5$ yards of fabric to make each suit, the expression $5x$ represents the total amount of fabric she used to make the suits. Since $y$ represents the total length of fabric Kaylani purchased, in yards, it follows from the equation $y=5x+6$ that Kaylani purchased $5x$ yards of fabric to make the suits, plus an additional $6$ yards of fabric. Therefore, the best interpretation of $6$ in this context is that Kaylani purchased $6$ yards more fabric than she used to make the suits.