Răspuns:
Explicație pas cu pas:
a + b = 18
a + 4 = 3 × ( - ) ( b - 6 )
a + 4 = - 3 × b + 18 ⇒ a = - 3 × b + 18 - 4 ⇒ a = - 3 × b + 14
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a + b = 18
( - 3 × b + 14 ) + b = 18
- 2 × b = 18 - 14
b = 4 : ( - 2 ) ⇒ b = - 2
a = 18 - ( - 2 ) ⇒ a = 20
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Verific:
20 + ( - 2 ) = 20 - 2 = 18 → suma
20 + 4 = 3 × ( - ) ( - 2 - 6 )
24 = 3 × 8 √