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b.3a + a =72
4a = 72
a = 72 ÷4
a = 18
jadi usia anaknya sekarang adalah 18 tahun
ayah = x.... anak = y
A. kalimat matematikanya yg garis bawah
x = 3y
x + 10 + y + 10 = 72
x + y = 52
b. Usia y (anak)
x + y = 52
3y + y = 52......... 4y = 52
y (anak) = 13
usia anak = 13