Question

Determinati a b c stiind ca :
a) a+4b+6c=44
b)4a+6c+5c=66
c)a+4b+2c=36

Answer 1

1. din (a) a = 44-4b-6c de aici => din (c) , schimbam din (a) datele : 44-4b-6c+4b+2c=36 => 44-4c=36 => 4c=8 => c=8/4 = 2 
2. din(b) schimbam datele ; 4(44-4b-6*2)+6*2+5*2=66 => 4(32-4b)+18=66 => 128-16c+18=66 => 16b=80 => b=80/16 = 5 
3. din (a) schimbam datele ; a=44-4*5-6*2 => a=44-20-12 => a=12