Question

Didalam kandang terdapat kambing dan ayam sebanyak 13ekor.jika jumlah kaki kaki hewan tersebut 32buah.

Answer 1

X = ayam ( 2 kaki )
y = kambing (4 kaki )
x + y = 13
2x + 4y = 32 : 2
_____________
x + y = 13
x + 2y = 16
________ -
-y= -3
y = 3
________
x + y = 13
x = 13-y
x = 13-3
x = 10
_______
jadi kambing = 3
jadi ayam = 10

Answer 2

Misal kambing = x
Maka ayam = y

Maka :

x + y = 13         (kali 2)  2x + 2y = 26
4x + 2y = 32    (kali 1)  4x + 2y = 32
                                      ______________ -
                                           -2x = -6
                                              x = 3

x + y = 13
3 + y = 13
y = 13 - 3
y = 10


Maka banyak ayam = y = 10
Maka banyak kambing = x = 3