Question

What is the slope?
x = -4

Answer 1

UNDEFINED

Explanation:

Any initial value set to equal x is considered an undefined rate of change [slope], which is a vertical line.

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Answer 2

The slope is undefined

Explanation:

x = -4 is a vertical line. Slope is defines as the change in y divided by the change in x.

(change in y)/(change in x)

All the points on this line have the same x value, so the change in x is zero. This means we have

(change in y)/0, which is undefined.