Solution of equations x - 2y = 7 and 2x - y = 8 is :

1. x = 3, y = 2

2. x = -3, y = 2

3. x = 3, y = -2

4. x = -3, y = -2

Solution of equations x + y = 2.1 and x - y = 0.3 is :

1. x = 1.2, y = 0.9

2. x = 1.2, y = -0.9

3. x = -1.2, y = 0.9

4. x = -1.2, y = -0.9