A) rule is triple x add 2
The table
X/y
7/23
2/8
-2/-4
8/26
0/2
100/302
1.5/6.5
B) rule multiply x by 2.5
2/5
9/22.5
-2/-5
-3 / -7.5
0/0
11/ 27.5
-4/-10
C) rule Divide x by 2 and add 1
X/Y
1 / 1.5
6 / 4
4/3
-20 / -9
-10 / -4
0 / 1
-7/ -2.5
