Which of the following systems is in rowechelon form 2x3yz

Which of the following systems is in row-echelon form? {2x+3y-z = 4 y-5z = 6 z = 1 {x+2y-4z = 1 y-2z = 1 3z = 1 {x-y-3z = 2 y-4z = 4 z = 2 {x+y-z = 2 y-2z = 4 -z = 5 An object moving vertically is at the given heights at the specified times. Find the position equation s= 1/2 at^2 + v_0 t+ s_0 for the object given the following conditions. At t = 1 seconds, s = 48 feet At t = 2 seconds, s = 64 feet At t = 3 seconds, s = 48 feet s = 16t^2 - 96t + 192 s = 32t^2 - 96t + 192 s =-16t^2 - 64t + 0 s = -32t^2 + 64t Which of the following systems is in row-echelon form? {2x+3y-z = 4 y-5z = 6 z = 1 {x+2y-4z = 1 y-2z = 1 3z = 1 {x-y-3z = 2 y-4z = 4 z = 2 {x+y-z = 2 y-2z = 4 -z = 5

Solution

1.A ) all are in row echelon form

1. B) s = -32 t² + 64

1.C ) all are in row echelon form