In Exercises 13-18, write an equation of the line that passes through the given points. 13. (0-4).(8.4)

14. (2,1),(0.-7)

15. (0,2).(4.3)

16. (0,-5).(-4,-1)

17. (8,0),(0,8)

18. (0,31.12-5

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.