What does x = ?
if you can't see the numbers i can type them

So you know that: 

2x+y=14+y
and
5x-y=x+13y

Here you have two equations with two unknown variables: 
If you isolate x from the second equations you get:
x=(7/2)y
Insert that in the first equations and solve for y: 
2*(7/2)y+y=14+y
y=2

Insert that value for y in one of the two equations (i chose the first): 
2x+2=14+2
x=7

Therefore x=7

Hope that helped. 

Actually you could start with isolating x, and then insert that in one of the two equations.

Ithink it is b and d