Question

B x+y=8
X-y=2. C x-y=1
x-y=5. d x+y=5
4x-y=0




Resolva os sistemas

Answer 1

Resposta:

Letra B)

X+Y= 8

X-Y= 2 => X= 2+Y

X+Y= 8

2+Y+Y= 8

2Y= 8-2

2Y= 6

Y= 6/2

Y=3

Agora vamos achar o X:

X-Y= 2

X-3= 2

X= 2+3

X= 5

Letra C)

X-Y=1 => X= 1+Y

X+Y= 5

X+Y= 5

1+Y+Y= 5

2Y= 5-1

Y= 4/2

Y= 2

Agora vamos achar o X:

X-Y= 1

X-2= 1

X= 1+2

X= 3

Letra D)

X+Y= 5 => X= 5-Y

4X-Y= 0

4X-Y= 0

4.(5-Y)-Y= 0

20-4Y-Y= 0

-4Y-Y= -20

-5Y= -20

Y= -20/-5

Y= 4

Agora vamos achar o X:

X+Y= 5

X+4= 5

X= 5-4

X= 1

Espero ter ajudado :)