Question

Calculati> E=a+4b+5c-792, daca a+6b=2b+c,iar c=120

Answer 1

E=a+4b+5c-792
E=(a+6b)-(2b+c)+6c-792
E=6 x 120 -792
E=720-792
E=-72

Answer 2

E=a+4b+5c-792, daca a+6b=2b+c,iar c=120
E=a+4b+5*120-792
E=a+4b+600-792
E=120+600-792
E=720-792
E=-72



a+6b=2b+120
a+6b-2b=120
a+4b=120