Chicken and rabbits (classic)

Grandmother breeding chickens and rabbits. It found that the yard has 35 heads and 108 legs. How many chickens and rabbits breeding in the yard?

Correct result:

x =  16
y =  19

Solution:

x+y = 35; 2x+4y = 108

x+y = 35
2•x+4•y = 108

x+y = 35
2x+4y = 108

x = 16
y = 19

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