Choice C is the correct answer. To verify if $(1, 8)$ is a solution, we substitute $x = 1$ and $y = 8$ into both equations.

First equation: $2x + y = 10$$2(1) + 8 = 2 + 8 = 10$ ✓ (True)

Second equation: $5x - y = -3$$5(1) - 8 = 5 - 8 = -3$ ✓ (True)

Since the point satisfies both equations, it is a solution to the system.

💡 Strategic Tip: A point must satisfy ALL equations in a system to be considered a solution.

Choice A is incorrect because the point does satisfy both equations.

Choice B is incorrect because the point satisfies both equations, not just the first.

Choice D is incorrect because we can always determine if a point is a solution through direct substitution.