Question

Please help I'm so confused!!
A ship was heading on a chartered route when it was blown off course by a storm. The ship is now ten miles west and seven miles south of its original destination. Using a coordinate grid make a drawing to show the original destination A and the current postion B of the ship. Using coordinates (x,y) to represent the original destination of the ship, write an expression to show its current location.
I'm really confused on how to find the coordinates to the original destination and to the current one. Help please.