Answer:
No it is not
Explanation:
In an additive relationship, two quantities can be expressed as related to each other through addition. It can be written as y = x + a, where y is related to x through the addition of a constant, “a”.
In this scenario, the "a" is not constant
1+2=3, 5+3=8, and 9+4=13
the number is increasing by one each time