Whenever you multiply by a negative number.
Hopefully that helps you a little.
Answer:An inverse variation can be represented by the equation xy=k or y=kx . That is, y varies inversely as x if there is some nonzero constant k such that, xy=k or y=kx where x≠0,y≠0 .
Step-by-step explanation:
<span>Volume = L * W * H cubic units
Surface Area = 2 * (LW + LH + WH) square units</span>
<em>x = 8</em>
Step-by-step explanation:

Add 1 to both sides.

Add 2x to both sides.

Divide 40 by 5.
x = 8