I am pretty sure it's Y=2/5x - 4.8. I'm sorry if it's wrong
There would be 3 in each cage because it is the biggest whole number you can divide 42 and 18 by
Step-by-step explanation:





2*4=8-1=7
7*4=28-2=26
26*4=104-3 = 101
101*4=404-4=400
the last number is multiplied by 4, then subtracting that number order in the sequence (2 was first so they subtracted 1, 7 was second so they subtracted 2, etc)