Question 9 Answer & Explanation - SAT Algebra

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algebra

Which equation represents a line perpendicular to the x-axis passing through $(3, 3)$ ?

$x = 3$

$y = 3$

$y = x$

$x + y = 6$

Correct Answer: A

Choice A is the correct answer. Perpendicular to x-axis means vertical.

Direction: Vertical (parallel to y-axis).
Form: $x = k$ .
Value: x-coordinate is 3.
Equation: $x = 3$ .

💡 Strategic Tip: Perpendicular to X = Vertical. Perpendicular to Y = Horizontal.

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

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