Which system of equations models this problem?

The variable x represents the number of angelfish Carlos bought and the variable y represents the number of parrotfish he bought.

Carlos bought 405 tropical fish for a museum display. He bought 8 times as many parrotfish as angelfish. How many of each type of fish did he buy?
 

A
x−y=405
y=8x
B
x+y=405
y=8x
C
x+y=8
y=405x
D
x+4y=8
y=405x