Set 7: Linear Functions (Advanced)

Explanation

Answer: A

What is the relationship between $y = x$ and $y = -x$ ?

Perpendicular

✓ Correct

Parallel

Neither

Coincident

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Check slopes. 1. Slopes: $m_1 = 1$ , $m_2 = -1$ . 2. Product: $1\times (-1) = -1$ . 3. Result: Perpendicular. Strategic Tip: These are the two main diagonals of the coordinate plane, crossing at 90 degrees. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is Perpendicular

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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