I could help you on one problem but you would need to solve on the rest
For number 11
The solutions are:
x=18
y=5
49+3x=7x-23
Add like terms
49+3x=7x-23
49+23=7x-3x
72=4x
Divide both sides by 4
18=x
x=18
Find the value of y: 3x=11y-1
(corresponding angles)
Plug in the value of x:
3x=11y-1
3(18)=11y-1
55=11y
Add 1 to both sides
54+1=11y
55=11y
Divide both sides by 11
5=y
y=5
Thus:
x=18
y=5