SAT Question c77ef2fb: Nonlinear Equations In One Variable And Systems Of Equations In Two Variables answer and explanation with Desmos solution

Choice A is correct. The hematocrit can be expressed in terms of the blood volume and the plasma volume by solving the given equation $V_B=\frac{V_P}{1-H}$ for $H$. Multiplying both sides of this equation by $(1-H)$ yields $V_B\times (1-H)=V_P$. Dividing both sides by $V_B$ yields $1-H=\frac{V_P}{V_B}$. Subtracting $1$ from both sides yields $-H=-1+\frac{V_P}{V_B}$. Dividing both sides by $-1$ yields $H=1-\frac{V_P}{V_B}$.