Here's the question you clicked on:
douglas12
Determine whether the matrix has an inverse. If an inverse exists, find it. -5 -18 2 7
hehe, don't leave us in suspense :P
So how do you find the inverse of that matrix
well, let's find the DETERMINANT first, can you find the determinant of that 2x2 matrix?
read it,at the middle page http://www.mathsisfun.com/algebra/matrix-inverse.html
@douglas12 If you are allowed to use technology in your work, check out the online matrix inverse calculator at http://www.bluebit.gr/matrix-calculator/
@douglas12 Post what you get as the inverse.