\fQuestion 16 1 pts Find the solution to the system of equations. 19x + 8y = -108 71x + 30y = -404 - 2x + y= -12 4x + z = 14 O x = 4, y = -4, z = -2 Ox = -4, y = 4, z = -2 No solution Ox = 4+t, y = -4+t, z =tQuestion 18 1 pt Consider the following statements. 1. Use elementary row operations to rewrite the matrix in row- echelon form. 11. Use backward substitution to find the solution. Ill. Write the augmented matrix of the system of linear equations. IV. Write the system of linear equations corresponding to the matrix in row-echelon form. Which of the statements above is the last step in performing Gaussian Elimination? O 11 . 0 111 . O IV . O 1.Question 19 1 p Find all the values of x so that below matrix is nonsingular. 1 -2 3 0 3 0 Or#-1 Or>0 OFER Question 20 1 ptsOTER Question 20 1 Find all the values of x so that below matrix is nonsingular. 1 1 1 1 Ox#-1 1 pt