the example is how you are supposed to answer, please follow it and do ALL of the things including the check. don't do the examples

1.) 8

2.) 23

3.) -7

Step-by-step explanation:

1.) x + 2 = 10             2.) y - 8 = 15                3.) a + 9 = 2

      -  2   -2                      + 8   +8                         - 9  -9

     x + 0 =8                y - 0 = 23                      a + 0 = -7

the answer is b