Question

resolva os seguintes sistemas do 1°grau por qualquer metodo.
{3x-2y=14 {4x-2y=25
{3x-5y=-19 {2x+7y=8
{5x+3y=7-2x {4x+y=2-y-x
me ajud porfs

Answer 1

$|3x-2y=14~~~~~~~~~~~~~~~~~~~~y=-7+1,5x\\|4x-2y=25~~~~~~~~~~~~~~~~~~~~y=-7+(1,5*11)\\4x-2(-7+1,5x)=25~~~~~~y=-7+16,5\\4x+14-3x=25~~~~~~~~~~~~~y=9,5\\4x-3x=25-14\\x=11\\\\ |3x-5y=-19~~~~~~~~~~~~~~~~~~~~~x=4-3,5y\\|2x+7y=8~~~~~~~~~~~~~~~~~~~~~~~~~x=4-(3,5*2)\\3(4-3,5y)-5y=-19~~~~~~~~~~x=4-7\\12-10,5y-5y=-19~~~~~~~~~~x=-3\\-10,5y-5y=-19-12\\15,5y=31\\y=\frac{31}{15,5}~~~~~~y=2$

Desculpa não responder a 3ª.