An example of a linear equation with three variables, x, y, and z, is given by: ax + by + cz + d = 0, where a, b, c, and d are constants and a, b, and c are non-zero. Linear equations occur frequently in most subareas of mathematics and especially in applied mathematics.
One study has shown that tea tree oil is more active against the organisms associated with transient carriage than against commensal skin flora and thus may be useful in eliminating the transient flora while suppressing but maintaining commensal flora. 21 The rapid kill rate of Clone 88 compared with standard tea tree oil shown for most of the organisms tested in the present study is encouraging and suggests that further clinical studies should be carried out.
APPLIED TO THE SKIN 1  : For nail fungus (onychomycosis): 100% tea tree oil solution applied twice daily for six months. 2  For athleteâs foot (tinea pedis): 25% or 50% tea tree oil solution applied twice daily for one month has been used.3  For acne: 5% tea tree oil gel applied daily. It is unclear if the effects are caused by the tea tree oil alone or the combination of lavender and tea tree oil. 2  Methicillin-resistant Staphylococcus aureus (MRSA) infection. 3  Evidence about the effects of tea tree oil on MRSA infection is unclear.