For the graph y = 4 find the slope of a line that is perpendicular to it. 4 0 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, - 5 0, y0 etc. The slope remains undefined!

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.