Answer:
(3,12) and (6,18)
Step-by-step explanation:
An order pair is not included if it make the equation false. Substitute each pair to determine this.
(1,9) ----> 9 = 3(1) + 6 -----> 9 = 9 TRUE
(3,12) ---> 12 = 3(3) + 6 ----> 12 = 15 FALSE
(10,36) ---> 36 = 3(10) + 6 -----> 36 = 36 TRUE
(6,18) ----> 18 = 3(6) + 6 ----> 18 = 24 FALSE
