Answer: D
1/2x-1+4=x
1/2x-x=-3
-1/2x=-3
x=6
Answer:
I cant answer this question since there is no table or graph

The equation of a elipse:

The length of the major axis is equal 2a if a > b or 2b if b > a.
We have

therefore the length of the major axis is equal 2 · 7 = 14.