Answer:
[tex]1. \\ 2x - 1 + y = 11 \\ y = 4 \\ then \\ 2x - 1 + 4 = 11 \\ 2x = 8 \\ x = 4 \\ \\ 2. \\ [/tex]
2x - 1 + 4 = 11
2x = 8
x = 4