Solve for y .

5(y+7)=10y

a) y=7
b)y=-7
c)y=35
d)y=-35

5(y+7)=10y
Use distributive property
5y+35=10y
Subtract 5y from both sides
35=5y
Divide 5 on both sides
Final A.) 7=y

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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.