Question

Resolva: 2x - y=3 B: x -3y=-1 Resolva os sistemas: x+y/2=x-1 j-1=2x-y+6/2

Answer 1

2x-y=3
x-3y=-1

isolando o Y, multiplicando a segunda equação por -2

2x-y=3
-2x+6y=2
_______
5y=5
y=5/5
y=1

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

x+y/2=x-1
2+2/2=2-1
2+1=2-1 ??? - Verificar os sinais

j-1=2x-y+6/2

j=2x-y+6/2-1

j=2*2 -1 +3 -1
j=4-1+3-1
j=5