Question 6 Answer & Explanation - SAT Algebra

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algebra

Which equation represents a line perpendicular to $x + y = 0$ ?

$y = x$

$y = -x$

$y = -x + 1$

$x + y = 2$

Correct Answer: A

Choice A is the correct answer. Find slope.

Original: $y = -x$ (Slope -1).
Perp Slope: 1.
Check Options: Option A ( $y=x$ ) has slope 1.

💡 Strategic Tip: $y=x$ and $y=-x$ are perpendicular.

Choice B is incorrect because parallel. Choice C is incorrect because parallel. Choice D is incorrect because parallel.

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