Question

Stiind ca a+b=6,determinati nr. x din 4 x a +3 x X+4 x b =66

Answer 1

(4×a+3×X+4×b)-(3×X)=4×6

4×a+4×b =24

66-24=3×X

42=3×X

X=42÷3

X=14

Răspuns:14

Answer 2

Bună!

a+b=6

4×a+3×x+4×b=66 ⇔

⇔ 4(a+b)+3x=66 ⇔

⇔ 4×6+3x=66 ⇔

⇔ 3x=66-24 ⇒ x=42:3 ⇒ x=14