Please show step by step. Clarity is appreciated

(Section 5.4) 20 points 4. a. i. Use matrix multiplication to find the construction of (a, b) with factor k = 1/a, where a > 1. ii. Use matrix multiplication to find the construction of (a, b) with factor k = a, where a > 1. b. Find the standard matrix for the reflection of IR about the line that makes an angle of 7 /4 (= 459) with the positive x-axis, and then use that matrix to find the reflection of (1, 2) onto this line