(Section 5.4) [20 points] 4. a. i. Use matrix multiplication to find the contraction of (a, b ) with factor k = 1 / a, where a > 1. ii. Use matrix multiplication to find the dilation of ( a, b ) with factor k = a, where a > 1. b. Find the standard matrix for the reflection of / R- about the line that makes an angle of x / 4 ( = 45 ) with the positive x-axis, and then use that matrix to find the reflection of ( 1, 2 ) onto this line