Answer :

1 | 2.5
2 | 5
3 | 10
4 | 20
5 | 40
6 | 80
7 | 160
8 | 320
9 | 640

Hopes this helps!!!
It would like this 

5x = 40

Divide 40 by 5

x = 8

So 5x8+40 = 80

y= 80

Hopefully this helps :)