SOLUTION: Please help me sole this problem: There are 13 animals in a barn. Some are chickens and some are pigs. There are 40 legs in the barn. How many are there of each animal?

Question 486431: Please help me sole this problem:
There are 13 animals in a barn. Some are chickens and some are pigs. There are 40 legs in the barn. How many are there of each animal?
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
Let x chickens
Let y pigs
Then
The animals have legs, so
The system of the equations

divide the second equation by 2

Subtract the first equation from the second one

pigs
Substitute into the first equation

chickens
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