Set 3: Linear Equations (Advanced)

Choice B is correct. Choice B is the correct answer. We add to undo the subtraction. 1. Start with the equation: $x - 6 = 19$ 2. Add 6 to both sides: $x = 19 + 6$ 3. Calculate: $x = 25$ 4. Verify: $25- 6 = 19$ ✓ The pattern is consistent: subtraction is undone by addition. Choice C is incorrect because this results from subtracting 6 from 19 instead of adding: $19- 6 = 13$. This applies subtraction twice. Choice D is incorrect because this is the negative of Choice C. It might result from reversing the subtraction: $6- 19 = -13$. Choice C is incorrect because this results from dividing: $\frac{19}{6} \approx 3.17$. Division doesn't solve subtraction equations.