cara 2×+3y=8 ×+5y=11

Bab Persamaan Linear
Matematika SMP Kelas VIII

x + 5y = 11
x = 11 - 5y

2x + 3y = 8
2 (11 - 5y) + 3y = 8
22 - 10y + 3y = 8
-7y = 8 - 22
y = -14/-7
y = 2

x = 11 - 5y
   = 11 - 5 . 2
   = 11 - 10
   = 1

jadi, x = 1 dan y = 2

2x + 3y = 8. ×1
x + 5y = 11. ×2

2x + 3y = 8
2x + 10y = 22
____________-

-7y = -14
y = 2

2x + 3y = 8
2x + 3×2=8
2x= 8 - 6
x = 1


Nilai x dan y adalah 1 dan 2