Sipho’s Mum wants him to learn to save his money. Sipho’s mum offers to add double the amount of money he saves in his bank account each month.

If x is the amount of money Sipho saves in the month and y is the total amount of money in Sipho’s bank account at the end of the month after his Mum’s deposit, write an equation to show the relationship between x and y. (Do not include any spaces in your answer)