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azzam = B
a = 3b
(a+10) + (B+10) = 76
4b + 20 = 76
4b = 56
B = 14
A = 42
anggpa x usia pak ahmad dan y usia anaknya
persamaan ke1 ) x = 3y
persamaan ke 2 ) (x + 10) + (3y + 10) = 76
x = 3y
x + y + 10 + 10 = 76 => => x +y + 20 = 76 => x + y = 76 - 20 => x + y = 56
x = 3y
x + y = 56 (gunakan cara substitusi)
x + y = 56
1(3y) + y = 56
3y + y = 56
4y = 56
y = 56/4
y = 14
substitusikan nilainya y :
x = 3y
x = 3(14)
x = 42
jadi usia pak ahmad 42 tahun dan usia azzam 14 tahun.
i hope this hepls :)