Answer:
10
Step-by-step explanation:
Given
[tex]x+y=8\\ \\4x-y=22[/tex]
Add these two equations:
[tex]x+y+4x-y=8+22\\ \\5x=30\\ \\x=6[/tex]
Substitute it into the first equation:
[tex]6+y=8\\ \\y=8-6\\ \\y=2[/tex]
Then
[tex]2x-y=2\cdot 6-2=12-2=10[/tex]
