Set 2: Linear Functions (Advanced)

Explanation

Answer: A

Which pair of lines intersects at a 90-degree angle?

$y = 5$ and $x = -2$

✓ Correct

$y = 5$ and $y = -2$

$y = x$ and $y = x + 1$

$y = 2x$ and $y = -2x$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Horizontal and Vertical. 1. $y=5$ : Horizontal. 2. $x=-2$ : Vertical. 3. Angle: 90 degrees (Perpendicular). Strategic Tip: H and V lines are always perpendicular. Choice B is incorrect because parallel. Choice C is incorrect because parallel. Choice D is incorrect because slopes are not negative reciprocals ( $2\times -2 = -4$ ).

Key Steps:

•

The correct answer is $y = 5$ and $x = -2$

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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