The y/x values all have the same ratio, 2/5. The line is
y = (2/5)x
Answer:
Irrational numbers can look like fractions: 

Irrational numbers have never ending decimals. Pi and e are also irrational numbers.
Those number are all powers of 10
10= 10^1
100= 10^2
1000= 10^3
and so on...