Free thyroxine (free T4) tests are used to help evaluate thyroid function and diagnose thyroid diseases, including hyperthyroidism and hypothyroidism, usually after discovering that the thyroid stimulating hormone (TSH) level is abnormal. T4 and another hormone called triiodothyronine (T3) are produced by the thyroid gland.
[When the determinant of a matrix is nonzero, linear system it represents is linearly independent]. When the determinant of a matrix is zero, it rows are linearly dependent vectors, and its columns are linearly dependent vectors.
Using the Matrix Calculator we get this: (I left the 1/determinant outside the matrix to make the numbers simpler). Then multiply A-1 by B (we can use the Matrix Calculator again): And we are done! The solution is: x = 5, y = 3 and z = -2. Just like on the Systems of Linear Equations page. Quite neat and elegant, and the human does the thinking while the computer does the calculating.