Set 12: Linear Functions

Explanation

Answer: A

If the slope of a line is undefined, which of the following could be its equation?

$x = -3$

✓ Correct

$y = -3$

$y = x$

$y = -3x$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Undefined slope means a vertical line. 1. Vertical lines: Have the form $x = k$ . 2. Match: $x = -3$ fits this form. Strategic Tip: Remember VUX: Vertical, Undefined, X=. Choice B is incorrect because it is horizontal (slope 0). Choice C is incorrect because slope is 1. Choice D is incorrect because slope is -3.

Key Steps:

•

The correct answer is $x = -3$

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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