OG详解-OG1 数学2 Q10

Choice A is correct. The solution to a system of equations is the ordered pair (x, y) that satisfies all equations in the system. It’s given by the first equation in the system that x +7 = 10. Substituting 10  for x +7  into the second equation yields 10² = y, or y = 100. The x-coordinate of the solution to the system of equations can be found by subtracting 7 from both sides of the equation x +7 = 10, which yields x = 3. Therefore, the ordered pair (3, 100) is a solution to the given system of equations.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.