im grade 7, unit test 3 one question help please...

find the common difference in the graph, (a = input b=output)
a 5 6 7 8 9
b 3.8 4.6 5.4. ? ?

1 answer

well, geez - just find one difference ...
4.6 - 3.8 = 0.8
Are all the other differences the same?