Question

Me ajudem por favor,é pra quarta

Answer 1

Resposta:

4)

A) ( 7,1)

B) 3,-2)

C) ( 1,7)

D) ( 15, 7)

________

5)

A) ( 30,10)

B) ( 4,2)

C) (1,4)

D) (-1, 1)

Explicação passo-a-passo:

4)

X + y = 8

X - y = 6

________

2x = 14

X = 14/2

X = 7

Y = 8 - x

Y = 8 - 7

Y = 1

2x + y = 4

X - y = 5

3x = 9

X = 9/3

X = 3

Y = 4 - 2x

Y = 4 - 2.3

Y = 4 - 6

Y = - 2

X + y = 8

- x + y = 6

________

2y = 14

Y = 14/2

Y = 7

X = 8 - y

X = 8 - 7

X = 1

x + y =22

X - y = 8

_________

2x = 30

X = 30/2

X = 15

Y = 22 - x

Y = 22 - 15

Y = 7

-------------------------------------------------------

5)

X = 3y

X - 2y = 10

3y - 2y = 10

Y = 10

X = 3.10

X = 30

x = 2 +y

X + y = 6

________

2 + y + y = 6

2y = 6 - 2

Y = 4/2

Y = 2

X = 2 + 2

X = 4

Y = 3 + x

X + y = 5

X + 3 + x = 5

2x = 5 - 3

X = 2/2

X = 1

Y= 3 + 1

Y = 4

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 = 1 - 2

X = - 1