Question

substuiçao matematica {x=y-2
2x+y=-1

Answer 1

2(y-2)+y=-1 2y-4+y=-1 2y+y=-1+4 3y=3 y=3/3 y=1 x=1-2=-1

Answer 2

x=y-2
2x+y=-1

2(y-2)+y=-1
2y-4+y=-1
3y=-1+4
3y=3
y=3/3
y=1

X=y-2
X=1-2
X=-1 

Logo  Y= 1 X= -1