Question

AJUDA AI É URGENTE

1{X+y=8
x-y=2

2{x-y=2
2x+y=7

3{x+5y=9
2x-5y=3

4{x+y=3
3x-y=5

5{x-y=-20
x+y=40












URGUENTE MAN ;-;​

Answer 1

Explicação passo-a-passo:

1)

2x=10 ÷2

x=5

x-y=2

5-y=2

-y=2-5

-y=-3 .(-1)

y=3

2)

3x=9 ÷3

x=3

x-y=2

3-y=2

-y=2-3

-y=-1 .(-1)

y=1

3)

3x=12 ÷3

x=4

x+5y=9

4+5y=9

5y=9-4

5y=5 ÷5

y=1

4)

4x=8 ÷4

x=2

x+y=3

2+y=3

y=3-2

y=1

5)

2x=20 ÷2

x=10

x-y=-20

10-y=-20

-y=-20-10

-y=-30 .(-1)

y=30

Answer 2

Método da adição!

X+y=8

x-y=2

2x-0=10

2x=10

x=10/2

x=5

5+y=8

y=8-5

y=3

(5,3)

x-y=2

x-y=22x+y=7

3x-0=9

3x=9

x=9/3

x=3

3-y=2

-y=2-3

-y=-1

(3,-1)

x+5y=9

2x-5y=3

3x-0=12

3x=12

x=12/3

x=4

2(4)-5y=3

8-5y=3

-5y=3-8

-5y=-5

y=-5/-5

y=1

(4,1)

x+y=3

x+y=33x-y=5

4x-0=8

4x=8

x=8/4

x=2

2+y=3

y=3-2

y=1

(2,1)

x-y=-20

x+y=40

2x-0=20

2x=20

x=20/2

x=10

10+y=40

y=40-10

y=30

(10,30)