The two lines y = x + 9 and y = -x − 9 are: parallel.
perpendicular.
neither parallel nor perpendicular.

Neither parallel nor perpendicular

Step-by-step explanation:

To tell whether two lines are parallel or perpendicular, look at their slopes.  

Parallel lines will have the same slope.  This isn't the case since the first line has a slope of 1 and the second has a slope of -1.

Perpendicular line have slopes that are negative inverses of the other.  This also isn't the case for these two lines.  Although the slopes have opposite signs, the numbers aren't inverses.

The two lines are neither parallel nor perpendicular.

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step-by-step explanation:

1. minimum

2. 6400

3. eight

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