5x + y = 10 dan 14x +3y =18 cari dengan metode subtitusi

5x+y=10 |×3| 15x+3y=30
14x+3y=18 |×1| 14x+3y=18
———————————(-)
x = 12
5x + y = 10
5.12 + y = 10
60 + y = 10
y = 10 – 60
y = (-50)

5x + y = 10
-> y = 10 – 5x

14x + 3y = 18
14x + 3(10-5x) = 18
14x + 30 – 15x = 18
-x = 18-30
-x = -12
x = 12

5x + y = 10
5(12) + y = 10
60 + y = 10
y = 10-60
y = -50