Question

1. x + 3x = 20
2. x + y = 15
tentukan Persamaan Linier Dua Variable / PLDV dan Bukan PLDV .. Sama caranya ya ...

Answer 1

PLDV
x + 3x = 20
x + y = 15 --> x = 15 -y

x + 3x = 20
15-y + 3(15 -y) = 20
15 - y + 45 - 3y = 20
60 - 4y = 20
-4y = 20 - 60
-4y = -40



x + y = 15
x + 10 = 15
x = 15 -10
x = 5

Hp [{5, 10}]

cara pertidaksamaan 
soal nya di ubah
x + 3x < 10
x + y < 15