Respuesta :

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y=4 is a horizontal line.  A perpendicular to this would be a vertical line of the form x=k.

This vertical line would have infinite slope, which is not a real value, thus it is undefined.

Undefined.

Explanation:

That is the only slope which cannot be defined by a number!

A line with a slope of zero is a horizontal line where, for any change in x, the change in y is always 0.

m=03,08,0x as long as x is not 0.

The line perpendicular to this is a vertical line which has a slope which is 'undefined'. For any change in y, the change in x is always 0, but we cannot divide by 0.

m=60,−50,y0 etc. The slope remains undefined!

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