Find parallel and perpendicular slopes

Perpendicular slopes are negative reciprocals; parallel slopes are equal.

1. A line is perpendicular to y = −x − 1. What is its slope?
2. A line is perpendicular to y = −4x − 5. What is its slope?
3. A line is perpendicular to y = −x + 9. What is its slope?
4. A line is perpendicular to y = 4x + 3. What is its slope?
5. A line is perpendicular to y = −2x − 1. What is its slope?
6. A line is perpendicular to y = 3x − 2. What is its slope?
7. A line is perpendicular to y = −4x + 10. What is its slope?
8. A line is perpendicular to y = −x − 3. What is its slope?
9. A line is perpendicular to y = −7x − 4. What is its slope?
10. A line is perpendicular to y = −9x + 10. What is its slope?
11. A line is perpendicular to y = 3x − 7. What is its slope?
12. A line is perpendicular to y = 8x + 5. What is its slope?
13. A line is perpendicular to y = x + 2. What is its slope?
14. A line is perpendicular to y = 12x + 1. What is its slope?
15. A line is perpendicular to y = −8x + 1. What is its slope?
16. A line is perpendicular to y = −4x + 6. What is its slope?
17. A line is perpendicular to y = −9x − 5. What is its slope?
18. A line is perpendicular to y = −11x + 10. What is its slope?
19. A line is perpendicular to y = −19x − 2. What is its slope?
20. A line is perpendicular to y = −7x + 1. What is its slope?