idolvuong200017 idolvuong200017
  • 16-07-2021
  • Mathematics
contestada

Giải hệ pt :{ 2x-3y=1
{x+2y=4

Respuesta :

ghaithgh
ghaithgh ghaithgh
  • 16-07-2021

x+2y=4 ] × (-2) —> -2x-4y=-8

2x-3y=1

-2x-4y=-8

_________o_o___

–7y=–7 —> y =1

2x-3y=1 —> 2x -3(1)=1 —> 2x-3=1 —> 2x=1+3 —> 2x=4

x=4/2 —> x=2

(x,y) —> ( 2,1)

I hope I helped you ^_^

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