Find the values of the variables. left bracket Start 2 By 3 Matrix 1st Row 1st Column a plus 2 2nd Column 12 z plus 1 3rd Column 8 m 2nd Row 1st Column 9 k 2nd Column 4 3rd Column 1 EndMatrix right bracket plusleft bracket Start 2 By 3 Matrix 1st Row 1st Column 3 a 2nd Column 6 z 3rd Column 3 m 2nd Row 1st Column 9 k 2nd Column 1 3rd Column 2 EndMatrix right bracket equalsleft bracket Start 2 By 3 Matrix 1st Row 1st Column 18 2nd Column negative 53 3rd Column 77 2nd Row 1st Column 36 2nd Column 5 3rd Column 3 EndMatrix right bracket Question content area bottom Part 1 a equals enter your response here z equals enter your response here m equals enter your response here k equals enter your response here