15y+31=61 how do I solve this

15y + 31 = 61
15y = 61 - 31
15y = 30
y = 30 ÷ 15
y = 2

Hello! i hope this
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.