What's the point here? Why would you remove one of the ordered pairs?
The only thing I see here that hints at an answer is that -1 is the first term of both (-1,1) and -1,0). If we got rid of one of these, then the relationship could be a function; otherwise it is not a function. Why? Because in the case of a function, all first elements of the ordered pairs are unique (different from all the other first elements).
The answer to this question is
0.23333333333
For one thing lines in spherical geometry can have two intersections whereas in euclidean Geometry two lines can intersect at most once (unless they are coincident lines)
To solve this, you need to have a common denominator for both terms. In order to get the equivalent fraction with the common denominator, you multiply each fraction by a version of 1. Here, it seems like our least common denominator (or LCD) is 12. Therefore, you multiply 1/4 by 3/3 and you multipy 2/3 by 4/4 to get 3/12 plus 8/12 = 11/12.
Hope this helps!