Elena bought 320 tropical fish for a museum display. she bought 7 times as many triggerfish as parrotfish. how many of each type of fish did she buy?

which is a system of equations to model the problem if x represents the number of parrotfish elena bought and y represents the number of triggerfish she bought?

a.
x – y = 320
y = 7x

b.
x + y = 7
y = 320x

c.
x + 7y = 320
y = 7x

d.
x + y = 320
y = 7x
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