Question

Are the following two lines perpendicular y=1/2x+9 and y=1/2x+3

Answer 1

When lines have the same slope they are parallel.
When lines have opposite reciprocal slopes, they are perpendicular.

The slope of both of these lines is 1/2, therefore the lines are parallel.

Answer 2

When lines have the same slope they are parallel.
When lines have opposite reciprocal slopes, they are perpendicular.

The slope of both of these lines is 1/2, therefore the lines are parallel.