Set 7: Linear Functions (Advanced)

Explanation

Answer: A

A line passes through $(4, -1)$ and $(4, 5)$ . What is its equation?

$x = 4$

✓ Correct

$y = 4$

$y = x - 5$

$x = -1$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Vertical line check. 1. Check x: Both are 4. 2. Conclusion: Vertical line $x = 4$ . Strategic Tip: If x doesn't change, the equation is $x = \text{value}$ . Choice B is incorrect because horizontal. Choice C is incorrect because diagonal. Choice D is incorrect because wrong value.

Key Steps:

•

The correct answer is $x = 4$

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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