Properties Of Equality

If a=b and c=d then a+c=b+d

If a=b and c=d then a-c=b-d

If a=b then ca=cb

If a=b then c≠0 then a/c = b/c

If a=b then either a or b may be substituted for the other in any equation (or inequality)

a=a

If a=b then b=a

If a=b and b=c then a=c

If 4(x-2), then 4(x-2) = 4x - 8