Cashews cost $2.70 per pound at a local grocery store. how much do 1.8 pounds of cashews cost?

I'm confused on this could anyone me and show me what i need to do to solve it.

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Using elimination, what is -4x+2y=-12 4x+8y=-24