Question

a-b=12 2a+3b=89 va rog sa-mi dati si mie rezolvarea.multumesc

Answer 1

A-b=12=>a=12+b 2a+3b=89; 2(12+b)+3b=89; 24+2b+3b=89: 5b=65; B=13; A=13+12=25; Bafta!

Answer 2

a-b=12 => a=12+b
2×12+2b+3b=89
24+5b=89
5b=89-2
5b=65
b=13
a=13+12
a=25