Lets say the determinant was -2, would the inverse be -2  or something different ? Please help me !!! THanks

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The determinant is what a matrix will give you if you solve it. Do you want the inverse of the determinant value? Or do you want the inverse of the matrix? Cause the inverse of -2 is 1/-2 REGARDLESS I think your answer is in this video: http://www.brightstorm.com/d/math/s/precalculus/u/systems-of-linear-equations-and-matrices/t/invertible-square-matrices-and-determinants