7. A: Quadrant II; B: Quadrant IV; C: axis; D: Quadrant I; E: Quadrant III; F: axis

8. x-int: 5/6; y-int: −5; slope: 6

9. x-int: −28/3; y-int: 7; slope: 3/4

10. x-int: 6; y-int: −8; slope: 3/4

11. x-int: −1; y-int: −2/3; slope: −2/3

12. x-int: 25/8; y-int: −25/3; slope: 8/3

13. y = 4x + 13

14. y = −7x + 21

15. y = 4/5x + 11

16. y = 3x + 2

17. y − 7 = −2/3 (x − 4)

18. y − 4 = 9/7 (x + 1)

19. y + 5 = −12/5 (x − 3) or y − 7 = −12/5 (x + 2)

20. y = 7/16 (x + 5) or y − 7 = 7/16 (x − 11)

21. 12x + 5y = 11

22. −7x + 16y = 35

23. (8, 0); (0, −18)

24. 9/4

25.

26.