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

Solve the following pairs of linear (simultaneously) equations using method of elimination by substitution:

2x + 3y = 8
2x = 2 + 3y