Misal: x = org dewasa y = anak anak 10x + 4y = rp 310.000 4x + 10y = rp 250.000 Maka berapa jika y + x=? Metode eliminasi tlg bantu

PLDV

10x + 4y = 310...×10
4x + 10y = 250..×4

100x + 40y = 3100
16x + 40y = 1000
----------------------------- (-)
84x = 2100
x = 2100/84
x = 25

4x + 10y = 250
4(25) + 10y = 250
100 + 10y = 250
10y = 250 -100
10y = 150
y = 150/10
y = 15

x = 25 × 1000 = 25.000
y = 15 × 1000 = 15.000

Jadi x + y = 25.000 + 15.000 = 40.000

semoga membantu ;)
Jangan lupa 5 bintang

10x +4y=310.000.....x10
4x +10y=250.000.... x4
__________________
100x +40y=3.100.000
16x+40y=1.000.000
__________________-
84x=2.100.000
x=25.000
4x +10y=250.000
100.000+10y=250.000
10y=250.000-100.000
10y=150.000
y=15.000
maka,x+y=25.000+15.000=40.000