5x+8y=100dan8x=5y+71

5x+8y =100 kali 5
8x-5y = 71 kali 8

25x+40y =500
64x-40y =568

tambahkan

89x =1068
x=1068/89= 12

5x+8y=100
5(12)=8y=100
8y=100-60
8y=40
y=5

jadi x=12
y=5

5x + 8y = 100
8x = 5y + 71

8x = 5y + 71
x = 5/8y + 71/8

5x + 8y = 100
5(5/8y + 71/8) + 8y = 100
25/8y + 355/8 + 8y = 100
8(25/8y + 355/8 + 8y = 100
25y + 355 + 64y = 800
89y = 800 - 355
89y = 445
y = 5

x = 5/8y + 71/8
x = 25/8 + 71/8
x = 96/8
x = 12

Maaf Kalau Salah