4x + 8y = 24. 10x + 15y = 20. Tentukan nilai x

(gnkn metode eliminasi dam substitusi)


4x+8y = 24. => ×5
10x+15y = 20. => ×2
____________
samakan slh satu koefisien agr dpt mnghilngkn variabel.


20x+40y= 120
20x+30y= 40
___________ -

10y = 80
y = 80/10=8

substitusi k slh satu prrsamaan
10x+15y=20
10x+15×8=20
10x+120=20
10x= -100
x = -100/10= -10