Question

resolva o sistema pelo metodo que achar favoravel 2a-3b=-5 / -a+b=1

Answer 1

{2a-3b=5
{-a+b=1 (2)
{2a-3b=5
{-2a+2b=2
-b=3.(-1)
b=-3
2a-3b=5
2a-3.(-3)=5
2a+9=5
2a=5-9
2a=-4
a=-4/2
a=-2
{a=-2 e b=-3}