Resolva o sistema {x+y=3y-2x
{X=3y-6
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{x+y=3y-2x
{X=3y-6
x+y=3y-2x
3y-6+y=3y-2 (3y-6)
4y -6 = 3y -6y +12
4y -6 = -3y +12
4y +3y = 12 +6
7y = 18
y = 18 /7
x = 3y-6
x = 3.18/7 - 6
x = 24/7 -6
x = 24/7 - 42/7
x = - 18/7
{X=3y-6
x+y=3y-2x
3y-6+y=3y-2 (3y-6)
4y -6 = 3y -6y +12
4y -6 = -3y +12
4y +3y = 12 +6
7y = 18
y = 18 /7
x = 3y-6
x = 3.18/7 - 6
x = 24/7 -6
x = 24/7 - 42/7
x = - 18/7
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