Choice A is the correct answer. We use substitution since $x = 5y - 1$ is already iStep 1: Substitute $x = 5y - 1$ into $2x + 3y = 24$: $2(5y - 1) + 3y = 24$$10y - 2 + 3y = 24$$13y = 26$$y = 2$

Step 2: Find $x$ using $x = 5y - 1$: $x = 5(2) - 1 = 10 - 1 = 9$

Solution: $(9, 2)$

Verification: $2(9) + 3(2) = 18 + 6 = 24$ ✓

💡 Strategic Tip: When x is isolated, substitute directly into the other equation.

Choice B is incorrect because$2(4) + 3(1) = 8 + 3 = 11 \ eq 24$.

Choice C is incorrect because$2(14) + 3(3) = 28 + 9 = 37 \ eq 24$.

Choice D is incorrect because$6 \ eq 5(1.4) - 1 = 7 - 1 = 6$.