Question

Stiind ca 2a+b=10 aflati 6a +3b

Answer 1

2a+b=10
Inmultim cu 3 toata expresia ⇒
3(2a+b)=3*10 
6a+3b=30 

Answer 2

2a+b=10 / 6a+3b=? / 6a+3b=30 /b=10-2a 6a+10-2a=30 /4a+10=30 / 4a=20 a=5 2a+b=10=>b=0