Answer:
k = 5
Step-by-step explanation:
3x + k
im going to replace the x with the numbers that go there
3 x 1 + k = 8
3 x 1 = 3
8 - 3 = 5
3 x 3 + k = 14
3 x 3 = 9
14 - 9 = 5
3 x 5 + k = 20
3 x 5 = 15
20 - 15 = 5
