Graph the solution set for this inequality: -6x -3y x ≤ -18
step 1: identify the x- and y- intercepts of the boundary line

when x = 0 y = ?
when y = 0 x = ?

where do the points on the graphs go?

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

the function makes a strait line horizontally with no x intercept but a y intercept at 9.