Choice C is the correct answer. The $y$ terms are opposites, so we add the equations.

Step 1: Add the equations: $(2x + y) + (2x - y) = 11 + 5$$4x = 16$$x = 4$

Step 2: Substitute $x = 4$ into the first equation: $2(4) + y = 11$$8 + y = 11$$y = 3$

Solution: $(4, 3)$

Verification: $2(4) - 3 = 8 - 3 = 5$ ✓

💡 Strategic Tip: Elimination is fastest when coefficients already match or are opposites.

Choice A is incorrect because$2(3) + 5 = 6 + 5 = 11$ ✓, but $2(3) - 5 = 6 - 5 = 1 \ eq 5$.

Choice B is incorrect because$2(5) - 1 = 10 - 1 = 9 \ eq 5$.

Choice D is incorrect because$2(2) + 7 = 4 + 7 = 11$ ✓, but $2(2) - 7 = 4 - 7 = -3 \ eq 5$.