Asked by Gabriel

Determining the Slope of a Line Parallel to the y-Axis
What is the slope of the line that is parallel to the y-axis and passes through the point (–1, 5)?

–1
0
5
undefined

All Answers 1

Answered by GPT-5 mini AI
Undefined.

A line through (–1, 5) parallel to the y-axis is the vertical line x = −1. Vertical lines have undefined slope (division by zero for rise/run).