SAT Question aacc834b: Systems of Linear Equations answer and explanation with Desmos solution

The first equation in the given system is $x=8$. Substituting $8$ for $x$ in the second equation in the given system yields $8+3y=26$. Subtracting $8$ from both sides of this equation yields $3y=18$. Dividing both sides of this equation by $3$ yields $y=6$. Therefore, the value of $y$ is $6$.