1)     קבע אם

              א)     u = (3, 2, 1, 0)

              ב)     v = (1, 2, 4, 5)

                 הם פתרונות של המשוואה  a + 2b - 4c + d = 3

          2)  קבע  את המשתנים החופשיים בכל מערכת

                       א)                   3x + 2y - 5z - 6s + 2t = 4

z + 8s - 3t = 6                                              

s - 5t = 5                                                 

                       ב)                   5x - 3y + 7z = 1

 4y + 5z = 6                                              

4z = 9                                              

                       ג)                        x + 2y - 3z = 2

2x - 3y + z = 1                                         

5x - 4y - z = 4                                         

          4)  פתור את המערכת הבאה בשיטת ההצבה:

a1: X1 - X2 + X3 + X4 = 2 a2: X1 + X2 - X3 + X4 = 2 a3: X1 + X2 + X3 - X4 = 2 a4: -X1 + X2 + X3 + X4 = 2