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2. what is the slope of the line?
a.) 0
b.) 1
c.) undefined
d.) infinity

The slope of a vertical line is not defined or it is said to be infinite since by definition the slope is the tangent of the angle that forms the line with the horizontal direction. Since in this case the angle is 90 degrees, the tangent of 90 degrees is infinite.
The answer is D.) Infinity

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