Set 17: Linear Functions

Explanation

Answer: A

Which equation represents a line with an undefined slope passing through $(-3, 4)$ ?

$x = -3$

✓ Correct

$y = 4$

$y = -3x + 4$

$x = 4$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Undefined slope means vertical. 1. Form: Vertical lines are $x = k$ . 2. Value: The x-coordinate is $-3$ . 3. Equation: $x = -3$ . Strategic Tip: Vertical lines lock the x-value. Horizontal lines lock the y-value. Choice B is incorrect because it is horizontal. Choice C is incorrect because it has a slope of -3. Choice D is incorrect because it uses the y-value.

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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