What is the slope of the line that is parallel to the y-axis and passes through the point (-1,5)?
1. -1
2. 0
3. 5
4. undefined

comparing the coordinates to the general equation of a line, where

y = bx + c

where b is the slope and c is the intercept on the y-axis.

from the question

x coordinate = -1

y coordinate =5

substituting them in the formula

5 = -1(b) + c

5 = -b + c. hence the slope is -1

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