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x-1 = 3(y-1) -> x-1 = 3y-3 -> x - 3y = -2
x+1 = 2(y+1) -> x+1=2y+2-> x - 2y = 1
Eliminasi x
-y = -3
y = 3
masukan nilai y ke persamaan
x -2y = 1
x = 2(3) +1
x = 6 + 1 =7
maka x = 7
y =3
maka jumlah umur mereka lima tahun lagi
5(x+y) = 5(7+3) = 5(10)
= 50 tahun