Question 821481
(x + 4) = 3(y + 4)
(x - 6) = 7(y - 6)
---
x + 4 = 3y + 12
x - 6 = 7y - 42 ---
put the system of linear equations
into standard form
---
x - 3y = 8
x - 7y = -36
Subtracting equati0n 2 from 1
4y = 44
Y = 11
Putting value of y in equation 1 we get 
X-3(11) =8
X -33 =8
X= 8+33
X= 41 
answer:
x= father = 41
y= son = 11