O
Lines a and b are parallel Line c is perpendicular to both line a and line b. Which
statement about lines a, b, and c is NOT always true?

The sum of the slopes of line b and line c is 0.
The product of the slopes of line a and line c is -1.
Ja
9
E
G
Line a and line b have the same slope.

The product of the slopes of line c and line b is -1.