What value of n in the equation nx+7=4y would give a line with slope 2

Plz which expression is equivalent to the expression below?

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!