Question

QUESTÃO DE MATEMÁTICA!! Pleasee​

Answer 1

a) {4x - y = 8

{x + y = 7

x = 7 - y

4 . (7 - y) - y = 8

28 - 4y - y = 8

- 4y - y = 8 - 28

- 5y = - 20 . (-1)

5y = 20

y = 20

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5

y = 4

x = 7 - y

x = 7 - 4

x = 3

S = {(3 , 4)}

b) {x = 5y

{x + 3y = 16

5y + 3y = 16

8y = 16

y = 16

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8

y = 2

x = 5y

x = 5 . 2

x = 10

S = {(10 , 2)}