What is the y intercept of -3x-9y=18

Factor out the common term 3:
−3(x+3y)=18

Divide both sides by −3:
x+3y=−3/18

Simplify \frac{18}{3}318 to 6:
x+3y=−6

Subtract 3y from both sides:

x=−6−3y

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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.