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texaschic101
when u have an equation such as y = 1......this means that u have a horizontal line which has a slope of 0.

* now if u had an equation such as x = 1...this would be a vertical line with an undefined slope....just so u know.
isyllus

Answer:

Undefined ( ∞ )

Step-by-step explanation:

The given line is y=1

It is horizontal line on coordinate plane.

Because y=k means y become constant and x varies.

If we draw perpendicular to horizontal line then it would be vertical line.

The equation of vertical line, x=h

The slope of horizontal line is 0

The slope of vertical line is undefined.

Because vertical line makes angle with x-axis 90°

Slope = tan 90°

∵ tan 90° is undefined.

Hence, The slope of perpendicular line of y=1 is undefined.

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