15 and 16.
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This is easily solved by using two equations in 2 unknowns and solving the system. x + y = 111 x - y = 43 If have not yet had the pleasure of studying algebra and the answer is important to you, you could hope the numbers are positive integers and try all pair of numbers whose sum is 43: 1,42 2,41 3,40 and so on, until you find a pair whose difference is 43.
linear pair ^^
The inverse of an ordered pair (a,b) is the pair (b,a). So you simply switch the order.
It is the distance to the right of the origin, which is the point whose coordinates are (0,0).
One possible pair is: 2+sqrt(3) and 5-sqrt(3).