In a candy shop, jellybeans which sell for $2.50 a pound are mixed with skittles which sell for $4 a pound to form a jellybean-skittles mix that sells for $3.50 a pound. how much of each are used to make 30 pounds of the mixture?

(a) write a system of linear equations that models this situation.
(b) use the substitution or elimination method to solve for how many pounds of jellybeans and how many pounds of skittles are used to make the 30-pound mixture.
hint:
equation one will represent that jellybeans and skittles will equal a total amount of pounds.
equation 2 will represent that cost of each individual component (added together) equal the total cost of a 30-pound mixture.