Question

Stiind ca a+b=14 si b+c=9 calculeaza:a) 2xa+3xb+c

Answer 1

Salutare!

$\bf a+b=14\:\:\:|\cdot2\:\:\text{(\it inmultim toata relatia cu 2)}$

$\bf 2a+2b=28$  (relatia 1)

$\bf b+c=9$   (relatia 2)

Adunam cele doua relatii

$\bf 2a+2b+ b+c=28+9$

$\boxed{\bf 2a+3b+ c=37}$

Raspuns:  $\boxed{\bf 2a+3b+ c=37}$