Step-by-step explanation:
x = age of father
y = age of son
x - 7 = 5(y - 7) = 5y - 35
x = 5y - 28
x + 14 = 2(y + 14) = 2y + 28
we use the identity of the first equation in the second equation :
5y - 28 + 14 = 2y + 28
3y = 28 + 28 - 14 = 42
y = 14
x = 5y - 28 = 5×14 - 28 = 70 - 28 = 42
the father is currently 42 years old.
the son is currently 14 years old.
