Question

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Answer 1

Resposta:

A) ( 12,3)

B) ( 60,15)

C) (- 6, - 3)

Explicação passo-a-passo:

A) x + y = 15

X - y = 9

__________

2x = 24

X = 24/2

X = 12

Y= 15 - x

Y = 15 - 12

Y = 3

B) x = 4y

2x - 7y = 15

2(4y) - 7y = 15

8y - 7y = 15

Y = 15

2x = 15 + 7y

2x = 15 + 7.15

2x = 15 + 105

2x = 120

X = 120/2

X = 60

C) x = 2y

2x - 5y = 3

_________

2( 2y) - 5y =3

4y - 5y = 3

- y = 3.(-1)

Y = - 3

2x = 3 + 5y

2x = 3 + 5.(- 3)

2x = 3 - 15

2x = - 12

X = - 12/2

X = -6