SAT Question dd797fe2: Linear Equations In Two Variables answer and explanation with Desmos solution

Choice C is correct. Since Mario purchased $4$ binders that cost $x$ dollars each, the expression $4x$ represents the total cost, in dollars, of the $4$ binders he purchased. Since Mario purchased $3$ notebooks that cost $y$ dollars each, the expression $3y$ represents the total cost, in dollars, of the $3$ notebooks he purchased. Therefore, the expression $4x+3y$ represents the total cost, in dollars, for all binders and notebooks he purchased. In the given equation, the expression $4x+3y$ is equal to $24$. Therefore, it follows that $24$ is the total cost, in dollars, for all binders and notebooks purchased.