Question

x-3y=9
2x+3y=6



2x+y= -3
x+y= -1



x-3y=0
2x+4y=6



3x+2y=5
5x-3y=2



x+5y=0
4x-y= -21



por favor alguém me ajuda ​

Answer 1

X-3y=9

2x+3y=6

________

3x = 15

x = 15/3

x = 5

x - 3y = 9

5 - 3y = 9

-3y = 9/5

y = 9/5 . (-1/3)

y = -9/15

y = -3/5

______________________________

2x+y= -3

x+y= -1    . (-1)

________

2x+y= -3

-x-y= +1  

________

x = -2

-x -y = 1

-(-2) - y = 1

2 - 1 = y

y = 1

______________________________

x-3y=0   . (-2)

2x+4y=6

________

-2x+6y=0

2x+4y=6

________

10y = 6

y = 6/10

y = 3/5

2x + 4y = 6

2x + 4 . 3/5 = 6

2x + 12/5 = 6

2x = 6 - 12/5

x = 18/5 . 1/2

x = 18/10

x = 9/5

______________________________

3x+2y=5 . (3)

5x-3y=2   . (2)

________

9x + 6y = 15

10x - 6y = 4

________

19x = 19

x = 19/19

x = 1

9x + 6y = 15

9 . 1 + 6y = 15

6y = 15 - 9

y = 6/6

y = 1

______________________________

x+5y=0   . (-4)

4x-y= -21

________

-4x-20y=0  

4x-y= -21

________

-21y = -21

y = 1

x + 5y = 0

x + 5 = 0

x = -5