Answer:
4 cats and 7 chicken
Step-by-step explanation:
x is for chicken and y is for cat
Each chicken has a head and 2 legs. Each cat has a head and 4 legs.
The first equation is for the heads and the second equation is for the legs.
I x + y = 11 |*(-2)
II 2x + 4y = 30
Ia -2x -2y = -22
Ia + II = IIa
IIa 2y = 8
y = 4
y in I
x + 4 = 11
x = 7