Question

Tolong dijawab dgn penyelesaiannya ya makasih^_^

Answer 1

1/4 x + 2/5 y = y + 2
1/4 x + 2/5 y - y = 2
1/4 x + 2/5 y - 5/5 y = 2
1/4 x - 3/5 y = 2 (pers.1)

1/2 x + 3/4 y = x + 7
1/2 x - x + 3/4 y = 7
1/2 x - 2/2 x + 3/4 y = 7
-1/2 x + 3/4 y = 7 (pers.2)

1/4 x - 3/5 y = 2 (× 20)
-1/2 x + 3/4 y = 7 (× 16)

5x - 12y = 40
-8x + 12y = 112
---------------------- +
-3x = 152
x = 152/-3
x = -50 2/3

5x - 12y = 40
5(-152/3) - 12y = 40
-760/3 - 12y = 40
-760/3 - 40 = 12y
-760/3 - 120/3 = 12y
-880/3 = 12y
y = -880/3 : 12
y = -880/3 × 1/12
y = -880/36
y = -24 16/36
y = -24 4/9

Jadi HPnya adalah {-50 2/3 , -24 4/9}