Yves bought 420 tropical fish for a museum display. he bought 6 times as many parrotfish as angelfish. how many of each type of fish did he buy?

which is a system of equations to model the problem if x represents the number of angelfish yves bought and y represents the number of parrotfish he bought?

a.
x + y = 6
y = 420x

b.
x + 6y = 420
y = 6x

c.
x – y = 420
y = 6x

d.
x + y = 420
y = 6x