Question

x+y=-7 e 3x+y=0 resolva usando o método da comparação

Answer 1

{x+y=-7 ==> y= -7-x

{3x+y=0 ==> y= -3x

y = y

-7-x = -3x

-x +3x = 7

2x = 7

x = 7/2 ✓

y= -3x = -3(7/2)= -21/2 ✓