Which equation represents a line with an undefined slope?

Equation of a line with an undefined slope will be x = k, where k = integer.

  Expression for the slope of a line is given by,

Slope =

If ,

Slope of the line =

Here the slope of the line will be undefined.

Since, all the points lying on a vertical line will have same x-coordinates will give .

Therefore, all lines perpendicular to x-axis or parallel to y-axis will have undefined slope and equation of the line will be x = k.

Where, k = Integer

    Hence, x = k, (k = all integers) will represent a line with undefined slope.

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answer: are you

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the equivalent expression are always the hardest ones but you look at the gcf also

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