Are two lines parallel?

Parallel lines have the same slope and different y-intercepts. Write yes or no.

1. Are the lines y = 6x + 6 and y = 6x − 7 parallel? Write yes or no.
2. Are the lines y = −4x − 8 and y = −4x − 9 parallel? Write yes or no.
3. Are the lines y = −3x + 5 and y = −3x − 2 parallel? Write yes or no.
4. Are the lines y = 6x − 9 and y = 6x + 1 parallel? Write yes or no.
5. Are the lines y = −4x − 6 and y = −4x + 1 parallel? Write yes or no.
6. Are the lines y = 10x + 2 and y = −2x − 7 parallel? Write yes or no.
7. Are the lines y = −4x + 7 and y = 3x − 4 parallel? Write yes or no.
8. Are the lines y = −6x + 7 and y = −4x + 6 parallel? Write yes or no.
9. Are the lines y = 7x + 5 and y = 7x + 1 parallel? Write yes or no.
10. Are the lines y = −12x + 2 and y = −12x + 7 parallel? Write yes or no.
11. Are the lines y = −9x − 5 and y = −9x − 5 parallel? Write yes or no.
12. Are the lines y = −4x − 2 and y = −4x + 7 parallel? Write yes or no.
13. Are the lines y = −6x + 3 and y = −8x − 7 parallel? Write yes or no.
14. Are the lines y = −8x + 7 and y = −8x − 9 parallel? Write yes or no.
15. Are the lines y = −4x + 9 and y = −4x − 8 parallel? Write yes or no.
16. Are the lines y = 13x − 1 and y = 8x − 9 parallel? Write yes or no.
17. Are the lines y = −5x − 6 and y = −5x − 3 parallel? Write yes or no.
18. Are the lines y = x + 9 and y = −12x − 4 parallel? Write yes or no.
19. Are the lines y = −9x − 1 and y = −9x − 6 parallel? Write yes or no.
20. Are the lines y = −3x − 4 and y = x + 4 parallel? Write yes or no.