10
algebra

If the slope of a line is undefined, which of the following could be its equation?

A

x=−3x = -3

B

y=−3y = -3

C

y=xy = x

D

y=−3xy = -3x

Correct Answer: A

Choice A is the correct answer. Undefined slope means a vertical line.

  1. Vertical lines: Have the form x=kx = k.
  2. Match: x=−3x = -3 fits this form.

💡 Strategic Tip: Remember VUX: Vertical, Undefined, X=.

Choice B is incorrect because it is horizontal (slope 0). Choice C is incorrect because slope is 1. Choice D is incorrect because slope is -3.

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Linear Functions Set 82