https://drive.google.com/file/d/116zAMV0QHHvbE5chZPo-3CV2GivApCli/view?usp=drivesdk

Part B (from Worked Examples 40, pp. 264-265). As you read along in the textbook, the answers to most of these questions should become blindingly obvious. Please be sure to answer each question directly and completely. 6. What does "R1 = r1/4" tell us to do? Be complete. 7. What does "R2 = -5r1 + r2" tell us to do? Be complete. 8. Let's say row 1 is: 1 5 and row 2 is: 0 1 | 3 We have the solution y = 3. Show how to back-substitute and solve for x. 9. Let's say row 1 contains: 2 3 8 | 12 What row operation would we use to change the 2 into a 1? Write it symbolically. 10. Let's say row 1 is: 1 14 5 8 and row 2 is: 3 5 7 What row operation could we use to change that "3" into a zero? Write it symbolically