Thread: matrix inversion

hello people i need a hand with this if you dont mind, its a matrix inversion and dont have a clue where to start.

Thanks

6.2a + 7.9v + 12.6s = 18
7.5a + 4.8v + 4.8s = 6.39
13a + 3.5v - 13s = -17.4

acceleration (a) ms-2 (minus)
Velocity (v) ms-1
displacement (s) m

Have you done Gaussian elimination with back substitution? Or Kramer's Rule? Or matrix inversion? Do you know what elementary row operations are?