Choice A is the correct answer. First, we need to i- $2x + y = 2(5) + 1 = 11$ ✓

• $x - 3y = ?$ → $5 - 3(1) = 2$

Step 1: Isolate $x$ in the second equation: $x = 2 + 3y$

Step 2: Substitute into the first equation: $2(2 + 3y) + y = 11$$4 + 6y + y = 11$$4 + 7y = 11$$7y = 7$$y = 1$

Step 3: Find $x$: $x = 2 + 3(1) = 5$

Solution: $(5, 1)$

Verification: $2(5) + 1 = 11$ ✓ and $5 - 3(1) = 2$ ✓

💡 Strategic Tip: When neither variable is isolated, choose the variable with coefficient 1 for easier algebra.

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

Choice C is incorrect because$2(6) + (-1) = 11$ ✓, but $6 - 3(-1) = 9 \ eq 2$.

Choice D is incorrect because$2(3) + 5 = 11$ ✓, but $3 - 3(5) = -12 \ eq 2$.