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=89-24
b=65:5
b=13
a=12+13
a=25

Answer 2

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; sper ca te-am ajutat! :)