Answer
a. Not an ordered pair.
b. Yes, ordered pair.
Work Step by Step
a.
Plug in x=5 and y=-1
2(5) - (-1) < 6
10 + 1 < 6
11 < 6 is FALSE. So it is NOT an ordered pair.
b.
plug in x=2 and y=7
2(2) - 7 < 6
4-7 < 6
-3 < 6 is TRUE. So YES, ordered pair.