Which equation describes the relationship between the variables in the table below? x y -1 1 9 2 81 4 6,561 5 59,049 ; each y-value is the previous y-value multiplied by 9. ; each y-value is the previous y-value plus 9 more than was added previously. ; each y-value is the previous y-value plus 9. ; each y-value is the previous y-value multiplied by another 9.