Question

x+y=10
x-y=4

qual é a solução da equação ?

Answer 1

Resposta:

x+y=10x−y=4

10x

x+y-10x=-y

x+y−10x=−y

x-10x-9x

-9x+y=-y

−9x+y=−y

y

-9x+y+y=0

−9x+y+y=0

yy2y

-9x+2y=0

−9x+2y=0

-9x+2y=0,10x-y=4

−9x+2y=0,10x−y=4

xx

-9x+2y=0

−9x+2y=0

2y

-9x=-2y

−9x=−2y

-9

x=-

x=−

9

1

(−2)y

-2y

x=\2}{9}y

x=

9

2

y

{2y}{9}

x10x-y=4

10

10×

9

2

y−y=4

v

10\{2y}{9}

20}{9}y-y=4

9

20

y−y=4

{11}{9}y=4

9

y=36}{11}

y=

11

36

{2}{9}y

x

x={2}{9}

x=

9

2

×

11

36

{36}{11}

x={8}{11}

x=

11

8

x={8}{11},y=\frac{36}{11}

x=

11

8

,y=

11

36