3
algebra

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

A

x=4x = 4

B

y=4y = 4

C

y=x−5y = x - 5

D

x=−1x = -1

Correct Answer: A

Choice A is the correct answer. Vertical line check.

  1. Check x: Both are 4.
  2. Conclusion: Vertical line x=4x = 4.

💡 Strategic Tip: If x doesn't change, the equation is x=valuex = \text{value}.

Choice B is incorrect because horizontal. Choice C is incorrect because diagonal. Choice D is incorrect because wrong value.

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Linear Functions Set 90