This is for a 100 level Economics class in Micro-Economics.
Draw a relatively elastic demand curve.
Draw a relatively inelastic supply curve.
If using the cross price elasticity of demand formula you get a negative number then the goods must be compliments.
If using the income elasticity of demand formula and you get a number that is greater than 0 the good is called a normal good.
The difference in operating in the long run or the short run is that in the short run one of the variable is fixed.