book Maths Puzzle Numerical Ability

I am having trouble translating this word problem into an algebraic equation can you please help? thanks

Six more than twice a number is four times the difference between three and the number. What is the number?

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book Other Question

Determine whether each relation is a funtion, justify your answer.

{(0,1), (1,0), (2,1), (3,1), (4,2)}

HOw do i solve this problem?
I am supposed to find the value of x and y and do not know where to start. Here is the problem:

x-4y+22
2x+5y=-21