I have added a little more assistance with question 3(d) below.

Did you read my tips on how to study and learn Math 1300?  If not, here is a link to those important suggestions:

Did you read my tips on how to study and learn Math 1300?  If not, here is a link to those important suggestions:

Did you see my tips for Assignment 1?

Did you see my tips for Assignment 2?

Here is a link to the actual assignment, in case you don't have it handy:

Study Lesson 1 (Systems of Linear Equations) and Lesson 2 (Row-Reduction and Linear Systems) from my Linear Algebra & Vector Geometry book to prepare for this assignment.

I define a RREF and REF matrix in the first couple of pages of Lesson 2.

Very similar to my Lesson 2, question 3.

Very similar to my Lesson 2, question 1. An independent variable is another way of saying a parameter.  Parameters are independent because they can take on any real number value.  The other variables are defined in terms of the parameters, so they are dependent variables.

Be careful when listing your solution in part (d)! The given matrix is only in REF. Either row reduce it to RREF first or use back substitution in order to properly state the solution. 

Very similar to my Lesson 2, questions 6, 7 and 8.

Very similar to my Lesson 2, question 9.

Very similar to my Lesson 2, question 12.