Set 3: Linear Equations (Intermediate)

Choice B is correct. Choice B is the correct answer. 1. Start with the equation: $2x + 15 = 25$ 2. Subtract 15 from both sides: $2x = 25 - 15$ 3. Simplify: $2x = 10$ 4. Divide both sides by 2: $x = \frac{10}{2}$ 5. Simplify: $x = 5$ 6. Verify: $2(5) + 15 = 10 + 15 = 25$ ✓ Choice D is incorrect because this results from adding 15 to 25: $40$, then $40 /2 = 20$. Wrong inverse operation. Choice D is incorrect because this is the value of $2x$. You need to divide by 2. Choice A is incorrect because this results from multiplying 40 by 2? No, maybe $10\times 8$? Unlikely. Probably just a random large number or calculation error.