Question

The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system. FYI it’s not b

Answer 1

c.

Explanation:

From the last row in the matrix z = 1.

From the second row:

y + 5z = -4

y = -4 -5(1) = -9.

From the first row:

x + -1 = -3

x = - 3 + 1

x = -2.