Set 15: Linear Equations (Intermediate)

Choice B is correct. Choice C is the correct answer. 1. Start with the equation: $5x + 15 = 40$ 2. Subtract 15 from both sides: $5x = 40 - 15$ 3. Simplify: $5x = 25$ 4. Divide both sides by 5: $x = \frac{25}{5}$ 5. Simplify: $x = 5$ 6. Verify: $5(5) + 15 = 25 + 15 = 40$ ✓ Choice C is incorrect because this results from adding 15 to 40: $55$, then $55 /5 = 11$. Wrong inverse operation. Choice D is incorrect because this is the value of $5x$. You need to divide by 5. Choice D is incorrect because this results from multiplying 25 by 5: $125$.