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x = 1/3 y ... pers 1
x - 5 = 1/4 (y - 5) ... pers 2
substitusi pers 1 ke pers 2
x - 5 = 1/4 (y - 5)
1/3 y - 5 = 1/4 (y - 5) ---> kedua ruas dikali 12
4y - 60 = 3 (y - 5)
4y - 60 = 3y - 15
4y - 3y = 60 - 15
y = 45
substitusikan y = 45 ke pers 1
x = 1/3 y
x = 1/3 (45)
x = 15
jadi usiaku sekarang 15 tahun
semoga membantu ya :)