Delaney made a 5 pound nut mixture from peanuts and almonds that cost $37.50. Peanuts cost $4.50 per pound and almonds cost $10.50 per pound. How many pounds of each type of nut did Delaney use in her mixture? Let p represent the number of pounds of peanuts in the mixture, and let a represent the number of pounds of almonds in the mixture.

What is the system that models this situation? :
Which of the following is a solution to the system: 2 lb peanuts and 3 lb almonds; 2.5 lb peanuts and 2.5 lb almonds; 4 lb peanuts and 1 lb almonds? SHOW YOUR WORK. :

-note-
tysm to who sees this and answers, i def prefer if the show your work was written/drawn instead of typed if possible as it's more easier for me and others to understand :)