Question

METODO DE SUBSTITUIÇAO
{2X+3Y=7
X+Y+2=0
?????? ME AJUDAM

Answer 1

2x+3y=7

x+y+2=0

x+y=-2

x=-2-y

2.(-2-y)+3y=7

-4-4y+3y=7

-4-y=7

-y=7+4

y=-11

x=-2-(-11)

x=-2+11

x=9