Question

URGENTE!!!!!!!!

a)x-y=1
-x+2y=3

b)x=3y
x-2y=3

c)2x+y=-3
x+y=-1​

Answer 1

Resposta:

a) x=5 y=4 b) x=9/5 y=3/5 c) y=-3 x=-4

Explicação passo-a-passo:

a) x-y=1

-x+2y=3

x=1+y

-x=3-2y

x=2y-3

y=2y-3-1

y=2y-4

y-2y=-4

-y=-4

y=4