Please help need help with this question

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.