Answer:
Carl needs 7 pairs of jeans and 14 shirts for 14 days camp trip.
Explanation:
Carl needs to take 2 pairs of jeans and 4 shirts for every 4 days he spends at camp.
Let x be the number of jeans and y the number of shirts Carl needs for 14 days at camp.
Relation 1:

=>

x = 7
Relation 2:

=>

y = 14
Hence, Carl needs 7 pairs of jeans and 14 shirts for 14 days camp trip.