Classical cryptosystems and Introductory number theory. Please dont answer after 09/26. Thank you

7. a. Encrypt the plaintext: "howareyou" using the affine function:c E(p) 5p+ 7 (mod 26). b. What is the decryption function: p D(c)? c. Use your decryption function to verify that it works. You are trying to mount a chosen plaintext attack against an affine cipher (mod 26). You are able to encrypt your chosen plaintext: hahaha. Specifically, you discover that the corresponding ciphertext is: NONONO. Determine the encryption key: (,). Reminder: the affine encryption function is of the form E(p) ap + (mod 26). 8