Question

Resolva o sistema a seguir x-5y=2
4x+7y=15

Answer 1

{x - 5y = 2--->×( - 4)
{4x+7y=15
:
{ - 4x+20y= - 8
{ 4x+7y=15
----------------(+)
27y=7
y= 7/27


4x+77/27=15
x=83/24

s ( 83/24 , 7/27)