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20x + 6y = 69000 1x 20x + 6y = 69000 _
2y = - 1000
y = - 1000
2
y = - 500
5x + 2y = 17000
5x + 2(-500) = 17000
5x + - 1000 = 17000
5x = 17000 + 1000
x = 18000
5
x = 3600
jadi y = - 500 dan x =3600
pertama kita kali kan 3 pada persamaan pertama
5x + 2y = 17.000 dikali 3 -----> 15x + 6y = 17.000
15x + 6y = 17.000
20x + 6y = 69.000 -
---------------
-5x + 0 = -52.000
-5x = -52.000
x = -52.000 : -5
x = 10.400
dan langkah selanjutnya kta lakukan substitusi
kita ambil persamaan 1
5x + 2y = 17.000
5 ( 10.400 ) + 2y = 17.000
52.000 + 2y = 17.000
2y = 17.000 - 52.000
2y = -35.000
y = -35.0000 : 2
y = -17.500
jadi nilai x = 10.400
y = -17.500