Samuel F. answered • 02/14/20

Math and Science Tutor | PhD Student in Engineering

Hello Lucy!

Must remember that the inverse of A is a matrix that if multiplied by A, the result is the identity matrix, in other words:

(a b) (1 -1) = (1 0)

(c d) (2 3) (0 1)

This will generate a 4 letters, 4 equations system:

a + 2b = 1

-a + 3b = 0

5b = 1

b = 1/5

a = 3/5

c + 2d = 0

-c + 3d = 1

5d = 1

d = 1/5

c = -2/5