Question 402902
x = father's age
y = son's age


x = y + 32
x + 4 = 5(y + 4)


Plug in x = y + 32 into the second equation. (substitution)


y + 32 + 4 = 5(y + 4)
y + 36 = 5y + 20
16 = 4y
y = 4


The father is 36 and the son is 4.