Question

Consider the line y=x+9.

What is the slope of a line parallel to this line?

What is the slope of a line perpendicular to this line?

Answer 1

parallel: 1, perpendicular: -1

Explanation:

slope of a parallel line is the same

slope of a perpendicular line is a negative recipricol

slope of y=x+9 is 1

parallel: 1

perpendicular: -1