Question

1. Responda com atenção:

$\times - y = 16$
$8 \times + y = 4$



$\times + y = 24$
$6 \times - y = 3$


$\times - y = 14$
$7 \times - y = 3$


$\times + y = 12$
$6 \times - y = 6$






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Answer 1

Resposta:

Explicação passo a passo:

x-y=16

8x+y=4

______

9x+0=20

x=20/9

x-y=16

20/9-y=16

-y=16-20/9

-y=144/9-20/9

-y=124/9 (-1)

y=-124/9

x+y=24

6x-y=3

______

7x+0=27

7x=27

x=27/7

x+y=24

27/7+y=24

y=24-27/7

y=168/7-27/7

y=141/7

x-y=14

7x-y=3

-x+y=-14

7x-y=3

______

6x+0=-11

6x=-11

x=-11/6

x-y=14

-11/6-y=14

-y=14+11/6

-y=84/6+11/6

-y=95/6 (-1)

y=-95/6

x+y=12

6x-y=6

______

7x=18

x=18/7

x+y=12

18/7+y=12

y=12-18/7

y=84/7-18/7

y=66/7