Let A be a 4 x 4 matrix and let x1,2,3,xa be given by

Let A be a 4 x 4 matrix and let x1,2,3,xa be given by-183-4613949-93-237125工1=工2=工3=工411228-85-3041-3-1If10001100Ax1=Ax2=Ax3=Ax4=1110111show that A is invertible and find A-1.