Solve y-2x=2 and 3x-2y=5 using substitution

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

If the value of cos330°is√3/2 then find cos 165°.

Need same math paper but the back now i hope your able to read it cleary i need with hw