For every real number a and b, and for c>0, if a>b then ac>bc; if a<b, then ac<bc. For every real number a and b, and for c<0, if a>b, then ac<bc; a<b, then ac<bc
For every real number a and b, and for c>0, if a>b, then a/c > b/c; if a<b, then a/c < b/c For every real number a and b, and for c>0, if a<b, then a/c < b/c; if a>b, then a/c>b/c