Question

identifica doua numere c si d , stiind ca c+d=42,iar c=5xd

Answer 1

c+d=42
c=5 d
5d+d=42
6d=42
d=42 ÷6
d=7
c+7=42
c=42 -7 = 35
35 +7 =42

Answer 2

c+d = 42
c = 5×d
inlocuim pe c in prima ecuatie cu 5×d
5×d + d = 42
6×d = 42
d = 42:6
d = 7
c = 5×d = 5×7 = 35

Verificare:
35+7 = 42


c = 35
d = 7