5x+3y=25 dan 2x+6y=24 tentukan metode substitusi

5x+3y=25
2x+6y=24 -
=3x+3y=1

Kelas 8 Matematika
Bab SPLDV

2x + 6y = 24 → dibagi 2 → x + 3y = 12
x = - 3y + 12

5x + 3y = 25
5 (-3y + 12) + 3y = 25
-15y + 60 + 3y = 25
-12y = 25 - 60
y = -35/-12
y = 35/12

x = -3y + 12
x = -3 . 35/12 + 144/12
x = -39/12

(35/12, -39/12)