Choice D is the correct answer. Multiply first by 2 and add to second.

Step 1: Multiply first by 2: $2x + 2y = 18$

Step 2: Add to second: $(2x + 2y) + (3x - 2y) = 18 + 7$$5x = 25$$x = 5$

Step 3: Substitute: $5 + y = 9 \Rightarrow y = 4$

Solution: $(5, 4)$

Verification: $3(5) - 2(4) = 15 - 8 = 7$ ✓

💡 Strategic Tip: Multiplying by 2 creates $+2y$ to cancel $-2y$.

Choice A is incorrect because$3(6) - 2(3) = 12 \ eq 7$.

Choice B is incorrect because$3(4) - 2(5) = 2 \ eq 7$.

Choice C is incorrect because$3(7) - 2(2) = 17 \ eq 7$.