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.
1 An acne treatment needs to contain at least 10% tea tree oil to fight acne infection. 2  Just smelling like tea tree oil does not mean a product actually fights acne infection. 3  Small amounts of tea tree oil that arenât enough to fight infection may still be enough to remove inflammation.