SAT Question e3bbde69: Systems of Linear Equations answer and explanation with Desmos solution

Choice B is correct. The second equation in the given system is $y=9x+1$. Substituting $9x+1$ for $y$ in the first equation in the given system yields $8x+9x+1=5$, which is equivalent to $17x+1=5$. Subtracting $1$ from both sides of this equation yields $17x=4$. Dividing both sides of this equation by $17$ yields $x=\frac{4}{17}$.