SAT Question 1006cad7: Systems of Linear Equations answer and explanation with Desmos solution

Choice B is correct. A solution to a system of equations must be the solution to each equation in the system. It follows that if $\left(x,y\right)$ is a solution to the system, the point $\left(x,y\right)$ lies on the graph in the xy-plane of each equation in the system. The point that lies on each graph of the system of linear equations shown is their intersection point $\left(2,4\right)$. Therefore, the solution to the system is $\left(2,4\right)$.