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January 30, 2015

Posted by **trevor** on Monday, August 9, 2010 at 6:56pm.

- math -
**Anonymous**, Monday, August 9, 2010 at 7:05pmx=number of 2 legged birds

y=number of 4 legged mammals

2x+4y=550

if there are a total of 155 animals and you know the number of 2 legged birds, you could subtract the two and find the number of 4 legged mammals

therefore, let y=155-x

substitution:

2x+4(155-x)=550

solve for x. that is the number of 2 legged birds!

then plug x into y=155-x and that will be the number of four legged mammals

- math -
**Roger**, Saturday, December 22, 2012 at 7:19pm15

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