Question

1• 2X-3y= 1 /x
2• 5X-4y=13 /y=3
3• 4X-3y=4 /X=2
4• 5X-y=210 /y=1
5• 2X+8y=12 /y=1
6• 6X-2y =10 /X= -2
7• 2X+7y=38 /y=4
8• X+y=9 /X=3
9• X+y=3 /y=3

Answer 1

Cálculos:

1) 2x - 3y = 1

2 . 1 - 3y = 1

- 3y = 1 - 2

- 3y = 1⠀⠀⠀(-1)

3y = 1

y = 1/3

2) 5x - 4y = 13

5x - 4 . 3 = 13

5x - 12 = 13

5x = 13 + 12

5x = 25

x = 25/5

x = 5

3) 4x - 3y = 4

4 . 2 - 3y = 4

8 - 3y = 4

- 3y = 4 - 8

- 3y = - 4⠀⠀⠀(-1)

3y = 4

y = 4/3

4) 5x - y = 210

5x - 1 = 210

5x = 210 + 1

5x = 211

x = 211/5

5) 2x + 8y = 12

2x + 8 . 1 = 12

2x + 8 = 12

2x = 12 - 8

2x = 4

x = 4/2

x = 2

6) 6x - 2y = 10

6 . (-2) - 2y = 10

- 12 - 2y = 10

- 2y = 10 + 12

- 2y = 22⠀⠀⠀(-1)

2y = - 22

y = - 22/2

y = - 11

7) 2x + 7y = 38

2x + 7 . 4 = 38

2x + 28 = 38

2x = 38 - 28

2x = 18

x = 10/2

x = 5

8) x + y = 9

3 + y = 9

y = 9 - 3

y = 6

9) x + y = 3

x + 3 = 3

x = 3 - 3

x = 0