Set 10: Linear Functions (Advanced)

Explanation

Answer: A

Are the lines $y = x$ and $x + y = 0$ perpendicular?

Yes

✓ Correct

No, parallel

No, neither

Cannot determine

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Check slopes. 1. Line 1: $y = x$ (Slope 1). 2. Line 2: $y = -x$ (Slope -1). 3. Product: $1\times (-1) = -1$ . 4. Result: Yes. Strategic Tip: These are the diagonals. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is Yes

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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