Find the slope of the graph of the following: 9x-3y=15

  Slope = 3  x-intercept = 5/3 = 1.66667  y-intercept = 5/-1 = -5.00000

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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.