Question 182663
                          Simultaneous Equations



F = Father S=Son



F - 3S = 0  (equation 1)
F - 2S = 15 (equation 2)



  F - 3S = 0
- F - 2S = 15
 
 =   -1S = -15 => -15/-1 = S = 15
Eliminate Value (F)




Son = 15 years of age




F - 3S = 0 => F - 45 = 0 = Value of (F) => 45 - 0 = 45/1 = F = 45




Father = 45 years of age



To prove it.
               F - 3S = 0           =          45 - 45 = 0   (equation 1)
               F - 2S = 15          =          45 - 30 = 15  (equation 2)