tolong carikan contoh soal dan pembahasan metode subtitusi ?3 aja

2× + y = 5 ; × + 2y = 4... 2x + y =5.. 2 (4-2y) + y = 5... 8 - 4y + y = 5... -3y = -3.. y = 1... x + 2y = 4... x + 2 (5 - 2x) = 4... x + 10 -10x = 4... -9x = -6 x = 1/3