7x + 2y = 7

-14x + 2y = - 11

Solve by substitution

x = 6/7, y = 1/2

Step-by-step explanation:

7x + 2y = 7

-14x + 2y = - 11

1) 7x + 2y = 7

2y = 7 - 7x

2) - 14x + 2y = - 11

-14x + 7 - 7x = - 11

- 21x = - 11-7

- 21x = - 18

x = 18/21 = 6/7

3) 2y = 7 - 7x = 7 - 7 * (6/7) = 7 - 6 = 1

2y = 1

y = 1/2