$5$ Linear Cipher $(6$ pts$)$

Qyodcxan Squatqa us ty oyna glycx qyodcxans xpgt gsxnytyow us glycx xajasqydas. Avskan M$.$ Vuzesxng.

Assume that the ciphertext us represents the plaintext word is$.$ Also, assume

that it was encrypted using a linear cipher. The numbering of the characters is

A$=1,$ B$=2,,$ Y $=25,$ Z $=0.$

Find the encryption function

y $=$ ax $+$ b mod $26$

which takes a plaintext letter as input and outputs the matching ciphertext

letter y$.$