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Travka [436]
3 years ago
5

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?

Which system of equations models this problem?



{x+y=405
y=8x

{x−y=405
y=8x

{x+4y=8
y=405x

{x+y=8
y=405x

Mathematics
2 answers:
siniylev [52]3 years ago
8 0
X + y = 405
y = 8x

To solve:
Plug the second equation into the first and solve for x.
x + 8x = 405
9x = 405
Divide both sides by 9
x = 45

Use the second equation to find y.
y = 8(45)
y = 360

45 angelfish
360 parrotfish
3241004551 [841]3 years ago
5 0
My Answer: <span>{x+y=405
y=8x

Hope I helped! :D</span>
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The answer to your questions are:

15.- 45 mg

16.- 25 kg

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                                            D = (a M)  / (a + 12)

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a = 4 years

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