2x + 10y = 14 5x - 9y = 1 metode substitusi

subs pers.1
2x+10y=14
2x+10y-10y=14-10y
2x=14-10y
x=7-5y

subs x=7-5y ke pers 2
5x-9y=1
5(7-5y)-9y=1
35-25y-9y=1
-25y-9y=1-35
-34y=34
y=-1