SAT Question 63c00e2b: Nonlinear Equations In One Variable And Systems Of Equations In Two Variables answer and explanation with Desmos solution

Choice A is incorrect. This equation is equivalent to $r-38=s+t$, not $\frac{r}{38}=s+t$.

Choice B is incorrect. This equation is equivalent to $r+38=s+t$, not $\frac{r}{38}=s+t$.

Choice D is incorrect. This equation is equivalent to $38r=s+t$, not $\frac{r}{38}=s+t$.