Question

Resolva o sistema 2X+5Y=8 X-2Y=7

Answer 1

Olá bom dia ☺

{2x+5y=8
{x-2y=7---->( -2 )
:
{2x+5y=8
{-2x+4y= -14
--------------------(+)
9y= -6
y= -6/9---->÷(3)
y= -2/3


x-2y=7
x-2×(-6/9)= -14

x=17/3

S ={ 17/3 ; -2/3 }