1. The first image is context needed for the second question, the second image is the question I want answered, I don't understand where I'm supposed to substitute b in
   

Question #3 [5 marks] Recall Question #2, Lab Report 3, where the traffic at the Welcome page (1), the Content page (2), and the Grades page (3) on the MA122 lab MyLearningSpace (MyLS) website were described by the following diagram. 900 5z-x+300 3y X 2 2y 3Z 3 75 To find x, y, and z, the system Ad = i was solved where: 900 7 A y and b = 300 75 Use Cramer's Rule and Maple (see Maple notes on MyLS) to find v.2. [5 marks] The MA122 lab MyLearningSpace (MyLS) website has 3 main areas; specifically the Welcome page (1), the Content page (2), and the Grades page (3). Suppose that in a given time frame, the traffic on the MA122 MyLS website was as described in the diagram below. 900 5z-x+300 3y As an example, the traffic at the Welcome page (Page 1) was as follows: X 2 i. x students entered the MA122 MyLS website at the Welcome page, 2y 3Z ii. 900 students exited the MA122 MyLS website from the Welcome page, 3 iii. 2y students came to the Welcome page from the Grades page (Page 3), 75 iv. 3y students went to the Content page (Page 2) from the Welcome page. (a) Set up a system of 3 equations and 3 unknowns that represents the traffic for the MA122 MyLS website and then, showing all of your steps, express the system's augmented matrix in reduced row echelon form. [Note: To help set up the system of equations, the equation representing the traffic at the Welcome page (1) is provided.] Traffic In Traffic Out Resulting Equation Welcome page (1): x + 2y = 900 + 3y x - y = 900 Content page (2): 3y = 3z + (52 - x+ 300) x + 3y - 82 = 300 Grades page (3): 3z = 2y + 75 -2y + 3z = 75