I'm doing process of elimination, and I have no idea how to do it. I need somebody to guide me through some questions.

1.) 3x + 5y = - 17

-5x - 5y = 15

2.) - 2x + 2y = 6

-2x + 3y = 13

3.) 7x + 11y = - 29

-x + y = - 1

1. 3x + 5y = - 17

-5x - 5y = 15

-2x = - 2

-2 - 2

x = 1

3 (1) + 5y = - 17

3 + 5y = - 17

- 3 - 3

5y = - 20

5 5

y = - 4

(x, y) = (1, - 4)

2. - 2x + 2y = 6

-2x + 3y = 13

-y = - 7

-1 - 1

y = 7

-2x + 2 (7) = 6

-2x + 14 = 6

- 14 - 14

-2x = - 8

-2 - 2

x = 4

(x, y) = (4, 7)

3. 7x + 11y = - 29 ⇒ - 7x - 11y = 29

-x + y = - 1 ⇒ - 7x + 7y = - 7

-18y = 36

-18 - 18

y = - 2

7x + 11 (-2) = - 29

7x - 22 = - 29

+ 22 + 22

7x = - 7

7 7

x = - 1

(x, y) = (-1, - 2)