Question

And y represents the number of tiles), which figure number has 40 tiles in it?

For a tile pattern with the rule y = 6x+4 (where x represents the figure number
How do you know?

Answer 1

Figure Number 6 has 40 tiles

Y=6x+4 (plug 40 in for y)
40=6x+4 (subtract 4 from each side)
36=6x (divide by 6)
6=x